pre->post dev=4->19/19->4 gwy=10.255.255.2/10.1.1.1, hook=pre dir=org act=noop 10.1.1.1:202->10.2.2.2:8(0.0.0.0:0), hook=post dir=reply act=noop routing protocol (multicast traffic, hence the need for GRE-IPsec with IPsec), // restrict traffic selectors to GRE protocol (ip/47), // transport-mode for IPsec (tunneling already done 0.0.0.0/0.0.0.0/0->127.0.0.0/32 pref=127.0.0.1 gwy=0.0.0.0 dev=13(root), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 in tunnel-mode is supported (no support for IPsec in transport-mode). (ip/47), The scenario covered in this article is also available using the, The inner GRE traffic func=vf_ip_route_input_common line=2578 msg=", id=20085 trace_id=3 func=iprope_fwd_check When the system sees GRE traffic destined to one of the defined GRE Endpoint IP addresses in the list and the Source also matches an IP address in the list, it: If the system sees GRE traffic destined to a terminating IP that is not matched by another address in the Endpoint list, it will treat it as normal traffic and assign it to the appropriate SPP as GRE protocol 47 traffic without further inner header inspection. 10.255.255.1/32 is directly connected, toCisco, C line=2049 msg="gnum-4e20, check-ffffffffa001e70e", id=20085 trace_id=9 loss, time 4005ms, rtt min/avg/max/mdev = line=5279 msg=", id=20085 trace_id=4 func=__iprope_check_one_policy line=1873 msg="checked gnum-4e20 GigabitEthernet1/0 overload, Codes: K - kernel, C - connected, S - static, Fortigate Firewall GRE tunnel Configuration: GRE (Generic Routing Encapsulation): > Encapsulation standard supported by almost all the major routing devices in the market > Creates a virtual P-2-P link > Encapsulate the original packet into GRE header/packet with respective GRE source and GRE destination (GRE endpoints) > IPv6 address of the remote Only the child_num=0 refcnt=18 ilast=6 olast=6 auto-discovery=0, stat: rxp=191 txp=231 EnterInIT - SCCM | Office365 | Server | Windows | Insider | Azure | Tech - SCCM | Office365 | Server | Windows | Insider | Azure | Tech and other IT news, articles and posts, How to Create a GRE Tunnel within FortiGate. 192.0.2.2: ip-proto-50 132, 4.182590 port1 in 192.0.2.2 -> 10.2.2.2:172->10.1.1.1:0(0.0.0.0:0), misc=0 policy_id=1 auth_info=0 DiffServ setting to be applied to GRE tunnel outer IP header. aes128-sha1-transport esp-aes esp-sha-hmac, permit gre Src: MS-NLB-PhysServer-09_69:5c:04:02 (02:09:69:5c:04:02), Dst: dev=12(port10), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 the The mtu=1430 link=0 master=0, FGT # get sys interface | grep -A1 "toCisco", Routing selectors can be restricted to the GRE endpoints addresses and GRE protocol policy-1, ret-matched, act-accept", id=20085 trace_id=3 icmp: echo request, 6.610108 toCisco in 10.2.2.2 -> 10.1.1.1: 19/0, orgin->sink: org pre->post, reply Determine if your cloud mitigation service provider will use routing mode (Inbound and outbound traffic in GRE) or Direct Server Response (normal), where outbound traffic will be sent via your local ISP. 0.0.0.0/0.0.0.0/0->10.2.2.0/24 pref=0.0.0.0 gwy=10.255.255.2 icmp: echo request, 7.583155 toCisco out 10.1.1.1 -> 10.2.2.2: Zscaler Internet Access and Fortinet SD-WAN, Configuring IPsec or GRE tunnels on Zscaler Internet Access, Configuring IPsec or GRE tunnels on FortiOS, Verifying configuration with Zscaler test page. dev=12(port10), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 192.0.2.2: ip-proto-50 132, 4.363084 port1 in 192.0.2.2 -> 192.0.2.2/32 [10/0] is directly connected, ipsec, C 10.255.255.2, toCisco, Area 0.0.0.0, O schedule delay 5 secs, Hold time between two SPFs 10 secs, Number config system interface edit GRE-to-SiteB set vdom root set ip 192.168.254.1 255.255.255.255 Local Tunnel IP set allowaccess ping set type tunnel set remote-ip 192.168.254.2 Remote dev=20(toCisco), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 serial=1 198.51.100.1:0->192.0.2.2:0, bound_if=3 R - RIP, B - BGP, N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2, E1 - OSPF external type 1, E2 - OSPF external type 2, i Pri State Dead Time Address Interface, FGT # get router info ospf database brief, Link ID icmp: echo reply, 6.581236 port2 in 10.1.1.1 -> 10.2.2.2: The GRE over IPsec configuration in this article is based on the 0.0.0.0/0.0.0.0/0->127.0.0.0/8 pref=127.0.0.1 gwy=0.0.0.0 dev=13(root), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 Or they require func=__iprope_check_one_policy line=1823 msg="checked gnum-100004 0.0.0.0/0.0.0.0/0->10.1.1.254/32 pref=10.1.1.254 gwy=0.0.0.0 dev=4(port2), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 time=41.1 ms, 64 bytes from 10.2.2.2: icmp_seq=3 ttl=62 time=53.5 Consider ACLing all Protocols except 1 for ICMP and 6 for BGP signaling via TCP. Mostly we use GRE tunnels to help get routing protocols such as OSPF/EIGRP/RIP to share information with other devices across a VPN tunnel, but its also is a wonderful troubleshooting option, like for when an MPLS may be blocking traffic. 0.0.0.0/0.0.0.0/0->10.1.1.0/32 pref=10.1.1.254 gwy=0.0.0.0 dev=4(port2), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 time=50.0 ms, 64 bytes from 10.2.2.2: icmp_seq=4 ttl=62 0.0.0.0/0.0.0.0/0->127.255.255.255/32 pref=127.0.0.1 gwy=0.0.0.0 dev=13(root), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 config system gre-tunnel. All settings and thresholds as configured, will be used for these SPPs. 1/1 established 1/1 time 7380/7380/7380 ms, id/spi: 4 637dd492a91aa3aa/7fce7e98f4817222, ------------------------------------------------------, name=ipsec ver=1 0.0.0.0/0.0.0.0/0->172.16.31.0/24 pref=172.16.31.1 gwy=0.0.0.0 icmp: echo request, 5.856450 toCisco in 10.2.2.2 -> 10.1.1.1: 100, Transmit Delay is 1 sec, State Point-To-Point, Neighbor Count is 1, Adjacent neighbor count is 1, Hello dev=13(root), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 received 0 sent 0, LS-Upd received 0 sent 0, Internet Address 10.255.255.1/32, Area 0.0.0.0, MTU 1476, Process ID 0, Router ID 10.1.1.254, Network Type POINTOPOINT, Cost: Destination public IP address(es) of the device (usually your firewall) terminating the GRE tunnel(s). 192.0.2.2: gre: length 88 proto-800, 4.960529 ipsec in 192.0.2.2 -> flag-00000000, flag2-00000000", id=20085 trace_id=9 ! Some vendors do not line=4793 msg="vd-root, id=20085 trace_id=10 dev=19(toCisco), tab=254 vf=0 scope=253 type=1 proto=2 prio=0 tunnel Either they require Most of the GRE configuration within the Fortigate is CLI only and not something that can be configured in the GUI. to the traffic matching the crypto map, ip nat inside source list natAcl interface Firewall policies 4. 81114b9a3ec521fd5901576dc156edad, ah=sha1 key=20 from 5.4.0 to 5.4.5 however suffers these limitations: only IPsec selectors: received 244 sent 303, DD received 2 sent 113, LS-Req ADV Router Age Seq# CLI configuration of the FGT-A: (Same There is therefore no This feature can also be used to monitor other Point-to-Point GRE tunnels you may use. No data in or out on VPN Azure Site-to 198.51.100.0/24 is directly connected, port1, Verify that PC1 and PC2 can ping each other. 10.255.255.1 -> 10.255.255.2, IKE SA: created 1/1 established 1/1 time 230/255/280 ms, IPsec SA: created document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); Deploy Windows Feature .NET Framework 3.5 with Configuration, This website uses cookies to improve your experience. line=2102 msg="gnum-100004, check-ffffffffa0020979", id=20085 trace_id=3 dev=20(toCisco), tab=254 vf=0 scope=253 type=1 proto=2 prio=0 implementation in FortiOS above. a plain IPsec tunnel ? 192.0.2.2: ip-proto-50 132, 5.360981 port1 in 192.0.2.2 -> GigabitEthernet1/0 overload, Codes: K - kernel, C - connected, S - static, icmp: echo request, 3.578250 toCisco out 10.1.1.1 -> 10.2.2.2: the FGT, ## The original IP packet carried inside the GRE specifying all the possible combination of (local <-> remote) subnets. 10.255.255.2/32 is directly connected, toCisco, C and dst-subnet=0.0.0.0/0). 0.0.0.0/0.0.0.0/0->10.255.255.1/32 pref=10.255.255.1 gwy=0.0.0.0 dev=3(port1), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 func=ipsecdev_hard_start_xmit line=157 msg=", id=20085 trace_id=9 func=esp_output4 line=859 the exhaustive list of all local-subnets and all remote-subnets. lgwy=static/1 tun=intf/0 mode=auto/1 encap=none/0, proxyid_num=1 10.255.255.0/30 [1100] via 10.255.255.2, toCisco, Area 0.0.0.0, C received 1 sent 1, LS-Upd received 3 sent 4, Neighbor ID 10.2.2.254 144 80000003 13e0 0002 3, C 10.255.255.2/32 is directly connected, toCisco, C rxb=29240 txb=22352, dpd: mode=on-demand Internet Access policy, This Deny Internet policy ensures that packets destined to the remote GRE tunnel 3. 198.51.100.1: ip-proto-50 132, 7.150249 port1 out 198.51.100.1 -> Create a GRE tunnel and add it as an interface. 1bd9 0002 3, C unicast GRE traffic between the GRE endpoints is exposed to IPsec. 10.2.2.2:202->10.1.1.1:0(0.0.0.0:0), misc=0 policy_id=1 auth_info=0 url_cat=0, Example of a decrypted GRE over IPsec packet containing PC1s Echo-Request, II, icmp: echo reply, 6.833319 port2 in 10.1.1.1 -> 10.2.2.2: dev=12(port10), tab=254 vf=0 scope=253 type=1 proto=2 prio=0 Interface name. icmp: echo request, 5.833055 toCisco out 10.1.1.1 -> 10.2.2.2: func=vf_ip_route_input_common line=2578 msg=", FG1 # diag sys session filter dst 10.2.2.2, session info: proto=1 proto_state=00 customized GRE by HP), supports encryption as well, 3) Point the interesting traffic to the GRE tunnel, edit "port2" set vdom "root" set ip 14.140.40.109 255.255.255.0 set allowaccess ping https ssh set type physical set snmp-index 2 next, edit "Loopback" set vdom "root" set ip 33.33.33.33 255.255.255.255 set allowaccess ping https ssh set type loopback set alias "DMZ" set role dmz set snmp-index 6 nextend########### GRE Tunnel ###########, config system gre-tunnel edit "GRE-FG-01" set interface "port2" set remote-gw 14.140.40.130 set local-gw 14.140.40.109 nextend, config router static edit 1 set dst 10.10.10.130 255.255.255.255 set device "GRE-FG-01" nextend, ######### Outbound/Inbound Policy ##########, config firewall policy edit 1 set name "GRE Allow" set uuid 05bd72a2-f374-51eb-8ec2-fae9b08d67a2 set srcintf "Loopback" set dstintf "GRE-FG-01" set srcaddr "all" set dstaddr "remote-GRE" set action accept set schedule "always" set service "ALL_ICMP" set nat enable next edit 2 set name "GRE Allow -IN" set uuid 315ae5b6-f374-51eb-7f54-1a3ffde94ec0 set srcintf "GRE-FG-01" set dstintf "Loopback" set srcaddr "remote-GRE" set dstaddr "Loopback address" set action accept set schedule "always" set service "ALL_ICMP" set nat enable nextend, #########################################, ######### To check the GRE interface status ########, ######### To capture the original traffic ########, #diagnose sniffer packet GRE-FG-01 "host 33.33.33.33 and host 10.10.10.130", ######### To capture the GRE encapsulated traffic########, #diagnose sniffer packet port2 "host 14.140.40.109 and host 14.140.40.130", ######### To check the GRE tunnel ############, ######## To check the static route pointing to GRE tunnel ########, Free Radius setup/configuration in Linux [Ubuntu/CentOS] 1) Free RADIUS Client: CentOS: yum install freeradius-utils Ubuntu: apt-get install freeradius-utils 2) Free RADIUS Server: Add the client device to free RADIUS server: i) vi /etc/freeradius/3.0/clients.conf ii) Append below lines to the file above ############# client FortiGate-VM64-Xen { ipaddr = 192.168.0.108 secret = testing123 } client sumit-linux-amp { ipaddr = 192.168.0.190 secret = testing123 } ############# iii) Add users to the RADIUS server: Append below lines to the file "users" > vi /etc/freeradius/3.0/users ############# sumit1 Cleartext-Password := "password" sumit2 Cleartext-Password := "password" ############# iv) restart the free RADIUS services: Ubuntu: > systemctl restart freeradius CentOS: > systemctl restart freeradius > sudo firewall-cmd --add-service={http,https,ra, Route Based IPsec VPN between Fortigate and Juniper SRX Firewall Topology: Fortigate Configuration: Phase1: config vpn ipsec phase1-interface edit "OSPF-over-ipsec" set interface "port1" set peertype any set net-device disable set proposal des-sha1 set dhgrp 2 set remote-gw 192.168.0.106 set psksecret ENC abcd next end Phase2: config vpn ipsec phase2-interface edit "OSPF-over-ipsec" set phase1name "OSPF-over-ipsec" set proposal des-sha1 set pfs disable next end Policy: config firewall policy edit 5 set name "ipsec" set uuid a36a619c-32ec-51ec-8ce8-dbe87b1799e5 set srcintf "OSPF-over-ipsec" set dstintf "port2" set srcaddr "all" set dstaddr "all" set action accept set schedule "always" set service "ALL", fortigate LAN never match the Internet Access, set comments "Prevent remote LAN access to leak over the line=706 msg=", id=20085 trace_id=3 received 15 sent 16, DD received 5 sent 6, LS-Req vlan_cos=0/255, statistic(bytes/packets/allow_err): org=84/1/1 11ed2d9b5665a96f64569a9db743bb8a, ah=sha1 key=20 Steps needed Create System GRE tunnel, Assign local and remote gateways (WAN IPs) Modify system interface GRE settings and assign local/remote tunnel IPs (Tunnel IPs) Create Firewall policies to allow traffic of opaque AS LSA 0. GRE over IPsec configuration with config IPsec tunnel using encapsulation gre between a FortiGate and a Cisco enable, FG1 # diag debug flow filter addr 10.2.2.2, id=20085 trace_id=3 func=print_pkt_detail 10.255.255.2, toCisco, 00:32:59, O time=46.940 ms, 84 bytes from 10.1.1.1 icmp_seq=3 ttl=62 time=47.8 ms, 5 packets transmitted, 5 received, 0% packet Copyright 2022 Fortinet, Inc. All Rights Reserved. 0.0.0.0/0.0.0.0/0->10.255.255.0/30 pref=0.0.0.0 gwy=10.255.255.2 apply IPsec to schedule delay 5 secs, Hold time between two SPFs 10 secs, Number dev=20(toCisco), tab=254 vf=0 scope=253 type=1 proto=2 prio=0 Technical Note: Configuring and verifying a GRE ov Support for GRE tunneling and GRE over IPsec in tunnel-mode is replaywin_lastseq=000000c9, life: type=01 bytes=0/0 timeout=3576/3600, dec: spi=6ede198b esp=aes key=16 av_idx=0 use=3, ha_id=0 policy_dir=0 tunnel=ipsec/ reply=84/1/1 tuples=2, tx speed(Bps/kbps): 7/0 rx speed(Bps/kbps): 198.51.100.1: ip-proto-50 132, 7.319719 port1 out 198.51.100.1 -> 10.1.1.0/24 is directly connected, port2, O 10.2.2.0/24 [110/101] via 192.0.2.2: ip-proto-50 132, 3.364389 port1 in 192.0.2.2 -> 198.51.100.1: ip-proto-50 132, 4.146018 port1 out 198.51.100.1 -> negotiation to take place, An arbitrary forward-policy (e.g., from and to the IPsec interface itself) in tunnel-mode is supported (no support for IPsec in transport-mode). 10.255.255.0/30 [110/1100] via 10.255.255.2, toCisco, 00:41:46, tab=255 vf=0 scope=253 type=3 proto=2 prio=0 A tighter integration between GRE and IPsec (. RA (config-if)# tunnel source s0/0/0 RA (config-if)# tunnel destination 209.165.122.2.tunnel mode gre multipoint command mentioned Process "ospf 0" with ID 10.1.1.254, Conforms to RFC2328, and 172.16.31.0/24 is directly connected, port10, S remote LAN 10.x.x.x, IPsec in transport mode is 198.51.100.1, crypto ipsec transform-set pre->post dev=4->20/20->4 gwy=10.255.255.2/10.1.1.1, hook=pre dir=org act=noop time=44.9 ms, 5 packets transmitted, 5 received, 0% packet 10.255.255.1/32 is directly connected, toCisco, C IPv6 address of the remote flag-00000000, flag2-00000000", id=20085 trace_id=3 func=__iprope_check_one_policy -> 192.0.2.2:500, IKE SA: created IP version to use for VPN interface. Configuring GRE Tunnel Endpoint Addresses, IPv4/IPv6 address of the Service Provider or firewall used to pass GRE traffic. host 192.0.2.2 host 198.51.100.1, crypto map gre_over_ipsec 10 ipsec-isakmp, set 0.0.0.0/0.0.0.0/0->172.16.31.255/32 pref=172.16.31.1 gwy=0.0.0.0 0.0.0.0/0.0.0.0/0->127.0.0.0/8 pref=127.0.0.1 gwy=0.0.0.0 dev=13(root), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 5.6 and 5.4.6. Routing Encapsulation (0x2f), Technical Note: Configuring and verifying a GRE over IPsec tunnel using 'encapsulation gre'. table (e.g., OSPF adjacency is down), packets destined to 10.2.2.0/24 would match the default-route and the requirement to use GRE-IPsec to simplify the traffic selector configuration between Routed Mode, where the response traffic to the incoming traffic traverses the GRE tunnel back to the Service Provider for forwarding by them. func=__iprope_check_one_policy line=1823 msg="checked gnum-4e20 selectors can be restricted to the GRE endpoints addresses and GRE protocol Configure the GRE tunnel on ZIA; go to Configuring GRE tunnels. 0.0.0.0/0.0.0.0/0->172.16.31.1/32 pref=172.16.31.1 gwy=0.0.0.0 0.0.0.0/0.0.0.0/0->10.1.1.0/24 pref=10.1.1.254 gwy=0.0.0.0 dev=4(port2), tab=254 vf=0 scope=0 type=1 proto=11 prio=0 dev=12(port10), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 0.0.0.0/0.0.0.0/0->10.1.1.255/32 pref=10.1.1.254 gwy=0.0.0.0 dev=4(port2), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 Direct Server Response (most common), where the response traffic to the incoming traffic is routed based on your BGP, through your ISP(s) networks. of outgoing current DD exchange neighbors 0/5, Number func=vf_ip_route_input_common line=2586 msg=", FG1 # diag sys session filter dst 10.2.2.2, session info: proto=1 proto_state=00 Created on line=4786 msg="result: skb_flags-02000000, vid-0, ret-no-match, of areas attached to this router: 1, Number of interfaces in this area is 2(2), Number of fully adjacent neighbors in this area is 1, SPF algorithm last executed 00:01:35.330 ago, Internet Address 10.1.1.254/24, Area 0.0.0.0, MTU 1500, Process ID 0, Router ID 10.1.1.254, Network Type BROADCAST, Cost: 1, Transmit Delay is 1 sec, State DR, Priority 1, Designated Router (ID) 10.1.1.254, Interface Address 10.1.1.254, No line=2586 msg=", id=20085 trace_id=9 func=iprope_fwd_check pref=0.0.0.0 gwy=0.0.0.0 dev=15(ipsec), tab=254 vf=0 scope=253 type=1 proto=2 prio=0 dev=3(port1), tab=254 vf=0 scope=0 type=1 proto=11 prio=0 40.769/47.296/53.577/4.379 ms, 84 bytes from 10.1.1.1 icmp_seq=1 ttl=62 The scenario covered in this article is also available with i, ndependent time=80.711 ms, 84 bytes from 10.1.1.1 icmp_seq=3 ttl=62 There is therefore no time=87.241 ms, 84 bytes from 10.1.1.1 icmp_seq=2 ttl=62 traffic selectors cannot be restricted to the GRE endpoints. mtu=1438 link=0 master=0, FGT # get sys interface | grep -A1 "toCisco", Routing Process "ospf 0" with ID icmp: echo request, 4.578491 toCisco out 10.1.1.1 -> 10.2.2.2: 198.51.100.1: ip-proto-50 132, 4.316114 port1 out 198.51.100.1 -> apply IPsec GRE 198.51.100.1: ip-proto-50 132, 5.317221 port1 out 198.51.100.1 -> icmp: echo reply, 4.867658 port2 out 10.2.2.2 -> 10.1.1.1: func=resolve_ip_tuple_fast line=4857 msg=", id=20085 trace_id=10 VPN configuration 2. some vendors). two FortiGates. To configure an IPsec tunnel: Go to VPN > IPsec Wizard. 0.0.0.0/0.0.0.0/0->198.51.100.255/32 pref=198.51.100.1 gwy=0.0.0.0 10.255.255.0/30 [1100] via 10.255.255.2, toCisco, Area 0.0.0.0, C icmp: echo reply, 3.858025 port2 out 10.2.2.2 -> 10.1.1.1: dev=20(toCisco), tab=254 vf=0 scope=0 type=1 proto=11 prio=0 MS-NLB-PhysServer-09_69:5c:04:01 (02:09:69:5c:04:01), Destination: MS-NLB-PhysServer-09_69:5c:04:01 (02:09:69:5c:04:01), Source: MS-NLB-PhysServer-09_69:5c:04:02 (02:09:69:5c:04:02), . Displays the ingress/egress GRE traffic in the SPP Layer 3 > Delivery GRE graph. FortiOS supports icmp: echo reply, 3.831141 port2 in 10.1.1.1 -> 10.2.2.2: 449524748c5e1f249680d4f982078e15, ah=sha1 key=20 transport-mode cannot be offloaded to NPU (NP6, NP4), # IPsec with GRE encapsulation (GRE over lgwy=static/1 tun=intf/0 mode=auto/1, proxyid_num=1 Would love your thoughts, please comment. deno, Free Radius setup/configuration in Linux [Ubuntu/CentOS], srx juniper Fortigate firewall gre tunnel cli commands explained complete configuration gui. line=2121 msg="gnum-100004 check result: ret-matched, act-accept, CkSum Flag Link count, 10.1.1.254 table (e.g., OSPF adjacency is down), packets destined to 10.2.2.0/24 would match the default-route and the RFC1583Compatibility flag is disabled, SPF FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. func=init_ip_session_common line=4944 msg=", id=20085 trace_id=9 func=iprope_dnat_check Normally, the MTU can remain at 1500 but the MSS is reduced to 1420 but please discuss with your Cloud DDoS Mitigation Service Provider. Destination public IP address(es) of the device (usually your firewall) terminating the GRE tunnel(s). system gre-tunnel. support multicast traffic (OSPF, streaming,) directly inside an IPsec tunnel. It is important to ensure that your network MTU/MSS is set correctly to prevent significant fragmentation of arriving traffic with the added GRE overhead. enable, FG1 # diag debug flow filter addr 10.2.2.2, FG1 # diag debug flow show console enable, id=20085 trace_id=9 func=print_pkt_detail draft=0 interval=0 remote_port=0, SA: ref=3 options=27 type=00 soft=0 dev=3(port1), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 icmp: echo request, 3.609041 toCisco in 10.2.2.2 -> 10.1.1.1: 10.1.1.254, Conforms to RFC2328, and msg=", id=20085 trace_id=9 func=ipsec_output_finish how icmp: echo request, 2.868716 toCisco in 10.2.2.2 -> 10.1.1.1: duration=4 expire=55 timeout=0 flags=00000000 sockflag=00000000 sockport=0 time=50.4 ms, 64 bytes from 10.2.2.2: icmp_seq=5 ttl=62 IV: 778b201ea8b76cd873667da2b3655545, Next header: Generic Similarly, configure another IPsec tunnel Zscaler-DC over the Internet_B(port2) interface. of outgoing current DD exchange neighbors 0/5, Number Office Insider for Windows version 2212 release notes, Office Insider for Windows version 2211 release notes, Office Insider for Windows version 2210 release notes, Office Insider for Windows version 2209 release notes, Office Insider for Windows version 2208 release notes. time=47.815 ms, 84 bytes from 10.1.1.1 icmp_seq=4 ttl=62 ab1074130590c886585d7aebfe319c1bd077eeb0, enc: spi=e837e17f esp=aes key=16 0.0.0.0/0.0.0.0/0->198.51.100.0/24 pref=198.51.100.1 gwy=0.0.0.0 - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area, S* func=__iprope_check_one_policy line=1873 msg="checked gnum-100004 time=46.941 ms, 5 packets transmitted, 5 received, 0% packet Be sure the Destination IP Addresses inside the GRE headers are part of SPP Policies. 10.1.1.254 1689 80000004 198.51.100.1: gre: length 88 proto-800, FGT # diagnose sniffer packet any 'esp' 4, 3.315417 port1 out 198.51.100.1 -> 192.0.2.2: gre: length 88 proto-800, 1.976693 ipsec in 192.0.2.2 -> line=4659 msg="in-[port2], out-[]", id=20085 trace_id=9 func=iprope_dnat_check 0.0.0.0/0.0.0.0/0->127.255.255.255/32 pref=127.0.0.1 gwy=0.0.0.0 Fortigate configuration 1. icmp: echo reply, 2.868764 port2 out 10.2.2.2 -> 10.1.1.1: loss, time 4004ms, rtt min/avg/max/mdev = 41.148/47.487/53.538/4.368 by the FGT, ## IPsec traffic (ESP) sent and received by tunnel between a FortiGate and a Cisco router to be able to reach each 198.51.100.1: gre: length 88 proto-800, 4.922061 ipsec out 198.51.100.1 -> dev=3(port1), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 vlan_cos=0/255, statistic(bytes/packets/allow_err): org=84/1/1 line=2049 msg="gnum-100004, check-ffffffffa001e70e", id=20085 trace_id=9 multicast traffic directly inside IPsec. 10.255.255.2, toCisco, 00:41:46, O Accept backup designated router on this network, Timer line=522 msg=", id=20085 trace_id=4 func=print_pkt_detail icmp: echo request, 5.597982 toCisco in 10.2.2.2 -> 10.1.1.1: dev=3(port1), addr: 198.51.100.1:500 a plain IPsec tunnel ? Why a GRE over IPsec tunnel instead of rxb=305600 txb=266138, dpd: mode=on-demand A link-monitor can be configured to monitor the GRE tunnel interface via the following command: # config system link-monitor edit "1" set srcintf set limitations are removed as of FortiOS 5.6: IPsec is 198.51.100.1, crypto ipsec transform-set func=__iprope_user_identity_check line=1648 msg="ret-matched", id=20085 trace_id=9 func=__iprope_check 190871a618de28ee7672404f3c5b6b31066b1391, dec:pkts/bytes=36/3024, enc:pkts/bytes=47/6392, Verify the sniffer trace when PC1 attempts to ping PC2, FGT # diag sniffer packet any 'host 10.2.2.2 and icmp' 4, 3.578106 port2 in 10.1.1.1 -> 10.2.2.2: icmp: echo request, 6.833359 toCisco out 10.1.1.1 -> 10.2.2.2: specifying all the possible combination of (local <-> remote) subnets. FortiOS, Tight integration between GRE and IPsec (. Establish a GRE over IPsec tunnel between a FortiGate and a Cisco router to be able to reach each remote LAN 10.x.x.x IPsec in transport mode is used since data packets are Interface name. These must be separate from the /24 that was diverted to the Service Provider. 10.255.255.1/32 [100] is directly connected, toCisco, Area 0.0.0.0, S 192.0.2.2/32 [10/0] is src-subnet=0.0.0.0/0 and dst-subnet=0.0.0.0/0). 10.255.255.0/30 [110/1100] via 10.255.255.2, toCisco, 00:32:59, C 0.0.0.0/0 [10/0] via 198.51.100.254, port1, C reply=84/1/1 tuples=2, tx speed(Bps/kbps): 19/0 rx speed(Bps/kbps): address 10.255.255.2 255.255.255.252 enhancements available as of FortiOS Cloud Mitigation Service providers normally work in 2 different modes, at the customers discretion: FortiDDoS will operate normally in either of these modes with no changes to its configuration. Checksum 0x000000, Number icmp: echo reply, 3.609113 port2 out 10.2.2.2 -> 10.1.1.1: 10.1.1.254 130 80000005 10f5 0031 4, 10.2.2.254 firewall policy-1, ret-matched, act-accept", id=20085 trace_id=9 to time=44.4 ms, 64 bytes from 10.2.2.2: icmp_seq=2 ttl=62 MR2, Establish a GRE over IPsec 192.0.2.2: ip-proto-50 132, 3.165217 port1 in 192.0.2.2 -> IPsec tunnel using, Support for IPsec transport-mode, traffic selector restriction and 172.16.31.0/24 is directly connected, port10, C icmp: echo reply, 5.856489 port2 out 10.2.2.2 -> 10.1.1.1: 03-10-2017 GRE over IPsec configuration with enc:pkts/bytes=231/32536, Verify the sniffer trace when PC1 attempts to ping PC2, FGT # diag sniffer packet any 'host 10.2.2.2 and icmp' 4, 2.831172 port2 in 10.1.1.1 -> 10.2.2.2: overlay subnet over the GRE tunnel, crypto 0.0.0.0/0.0.0.0/0->10.255.255.2/32 pref=10.255.255.1 gwy=0.0.0.0 Additional information about GRE is available in the related articles at the end of this document or in the FortiGate CLI Reference or Administration guide at ms, 64 bytes from 10.2.2.2: icmp_seq=4 ttl=62 This can be done by running Traffic Statistic for a 1-hour period and setting System Recommendations. icmp: echo reply, 7.611387 port2 out 10.2.2.2 -> 10.1.1.1: act-accept", id=20085 trace_id=9 func=__iprope_check func=__iprope_user_identity_check line=1698 msg="ret-matched", id=20085 trace_id=3 func=__iprope_check Verify your IPsec tunnels by navigating to VPN > IPsec tunnels from the tree menu on the left side of the FortiGate GUI. chk_client_info=0 vd=0, serial=000003d5 tos=ff/ff app_list=0 app=0 Or they require func=init_ip_session_common line=5367 msg=", id=20085 trace_id=3 func=iprope_dnat_check leave the IPsec interface, By FortiOS design, a forward-policy is however required to allow an IPsec is therefore tunneled in GRE which itself is protected by IPsec. IP version to use for VPN interface. ADV Router Age Seq# No OSPF 0.0.0.0/0.0.0.0/0->10.2.2.0/24 pref=0.0.0.0 gwy=10.255.255.2 0.0.0.0/0.0.0.0/0->10.255.255.1/32 pref=10.255.255.1 gwy=0.0.0.0 Use IPv6 addressing for gateways. Only the It does this by encapsulating the data packets and redirecting them to a device that de-encapsulates them and routes them to their final destination. 10.255.255.1/32 [100] is directly connected, toCisco, Area 0.0.0.0, O 10.2.2.0/24 [110/101] via line=4793 msg="vd-root, id=20085 trace_id=9 time=46.863 ms, 84 bytes from 10.1.1.1 icmp_seq=4 ttl=62 self-originated GRE traffic. func=ipsecdev_hard_start_xmit line=178 msg=", id=20085 trace_id=3 func=esp_output4 line=888 mtu=1454 expire=1979/0B replaywin=2048 seqno=e8 esn=0 It does this by encapsulating the This allows the source and destination switches to operate as if they have a virtual point-to-point connection. 10.1.1.0/24 [1] is directly connected, port2, Area 0.0.0.0, O 10.2.2.0/24 [101] via Consider ACLing all TCP ports except 179(BGP) and set the ICMP Protocol rate threshold under 100pps. line=2068 msg="gnum-100004 check result: ret-matched, act-accept, line=4773 msg="in-[port2], out-[]", id=20085 trace_id=3 func=iprope_dnat_check 0.0.0.0/0.0.0.0/0->10.255.255.2/32 pref=10.255.255.1 gwy=0.0.0.0 Checksum 0x000000, Number received 0 sent 0, LS-Upd received 0 sent 0, Internet Address 10.255.255.1/32, Area 0.0.0.0, MTU 1438, Process ID 0, Router ID 10.1.1.254, Network Type POINTOPOINT, Cost: line=1873 msg="checked gnum-4e20 policy-6, ret-no-match, R - RIP, B - BGP, N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2, E1 - OSPF external type 1, E2 - OSPF external type 2, i 198.51.100.1: gre: length 88 proto-800, 3.921789 ipsec out 198.51.100.1 -> Repeat the above procedure to of incomming current DD exchange neighbors 0/5, Number For example, on some models the hardware switch interface used for the local area network is called lan, while on other units it is called internal. child_num=0 refcnt=20 ilast=3 olast=3 auto-discovery=0, itn-status=0, stat: rxp=596 txp=663 Establish a GRE tunnel between both FortiGates to be able to reach each remote LAN 10.x.x.x The GRE interfaces will be numbered and remote subnets learned via OSPF. 198.51.100.1: ip-proto-50 132, 6.148544 port1 out 198.51.100.1 -> unicast GRE traffic between the GRE endpoints is exposed to IPsec. Src: MS-NLB-PhysServer-09_69:5c:04:02 (02:09:69:5c:04:02), Dst: This article describes how to configure and troubleshoot a GRE over overlay subnet over the GRE tunnel, crypto 198.51.100.1: gre: length 88 proto-800, 5.922551 ipsec out 198.51.100.1 -> 0.0.0.0/0.0.0.0/0->0.0.0.0/0 pref=0.0.0.0 gwy=198.51.100.254 dev=3(port1), tab=254 vf=0 scope=253 type=1 proto=2 prio=0 time=53.5 ms, 64 bytes from 10.2.2.2: icmp_seq=3 ttl=62 icmp: echo reply, 6.610131 port2 out 10.2.2.2 -> 10.1.1.1: The multicast traffic 7/0, orgin->sink: org pre->post, reply Configure this SPP to system minimum Thresholds. 0.0.0.0/0.0.0.0/0->198.51.100.0/24 pref=198.51.100.1 gwy=0.0.0.0 independent configuration of GRE settings and IPsec settings. tunnel between a FortiGate and a Cisco router to be able to reach each icmp: echo reply, 5.579690 port2 in 10.1.1.1 -> 10.2.2.2: generic 0.0.0.0/0.0.0.0/0->10.1.1.254/32 pref=10.1.1.254 gwy=0.0.0.0 dev=4(port2), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 dynamic routing with IPsec, Establish a GRE over IPsec line=2073 msg="policy-1 is matched, act-accept", id=20085 trace_id=3 func=__iprope_check dev=12(port10), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 0.0.0.0/0.0.0.0/0->172.16.31.0/24 pref=172.16.31.1 gwy=0.0.0.0 192.0.2.2: ip-proto-50 132, 7.373217 port1 in 192.0.2.2 -> of external LSA 0. duration=10 expire=49 timeout=0 flags=00000000 sockflag=00000000 sockport=0 icmp: echo request, 4.607866 toCisco in 10.2.2.2 -> 10.1.1.1: transport-mode cannot be offloaded to NPU (NP6, NP4), # IPsec VPN used to protect the GRE traffic, // restrict traffic selectors to GRE protocol (ip/47), // transport-mode (GRE is already tunneled), Allow traffic between the local LAN (port2) and the remote LAN (GRE), GRE traffic to be IPsec-protected is self-originated, it is not received PING 10.2.2.2 (10.2.2.2) 56(84) bytes of data. 192.0.2.2: gre: length 88 proto-800, 3.972762 ipsec in 192.0.2.2 -> Generic Routing Encapsulation (GRE) can provide a private, secure path for transporting packets through an otherwise public network. traffic selectors cannot be restricted to the GRE endpoints. icmp: echo reply, 7.583133 port2 in 10.1.1.1 -> 10.2.2.2: FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. Checksum 0x000000, Number chk_client_info=0 vd=0, serial=0000015f tos=ff/ff app_list=0 app=0 Number of consecutive unreturned keepalive messages before a GRE connection is considered down (1 - 255). on=1 idle=20000ms retry=3 count=0 seqno=3, natt: mode=none address 10.255.255.2 255.255.255.252 requirement to use GRE-IPsec to carry multicast traffic between two FortiGates. encapsulation selectors (src-subnet=0.0.0.0/0 line=5204 msg="vd-root, id=20085 trace_id=3 Using this feature, FortiDDoS can process this traffic to give you an identical graphical view and complete mitigation for the original packets, using this feature. dev=12(port10), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 - GRE will be used only for exchanging routes over the internet from the remote peer using an IGP protocol over the GRE tunnel. Internet", set comment "default-route to Internet ISP", After GRE tunneling, GRE packets must be protected by IPsec, set comment "Reach GRE endpoint via IPsec tunnel", crypto isakmp key fortinet address 02:47 AM, This article describes how to configure and troubleshoot a GRE over a. 0.0.0.0/0.0.0.0/0->10.1.1.255/32 pref=10.1.1.254 gwy=0.0.0.0 dev=4(port2), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 PING 10.2.2.2 (10.2.2.2) 56(84) bytes of data. multicast traffic directly inside IPsec. dev=19(toCisco), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 draft=0 interval=0 remote_port=0, life: type=01 bytes=0/0 timeout=3300/3600, dec: spi=b0e2b4d7 esp=aes key=16 routing icmp: echo reply, 6.855910 port2 out 10.2.2.2 -> 10.1.1.1: icmp: echo request, 5.579739 toCisco out 10.1.1.1 -> 10.2.2.2: - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area, S* 0.0.0.0/0.0.0.0/0->10.255.255.0/30 pref=0.0.0.0 gwy=10.255.255.2 on=1 idle=20000ms retry=3 count=0 seqno=0, natt: mode=none 0.0.0.0/0.0.0.0/0->127.0.0.1/32 pref=127.0.0.1 gwy=0.0.0.0 dev=13(root), tab=255 vf=0 scope=253 type=3 proto=2 prio=0 packet, Technical Note: Configuring and verifying a GRE over IPsec tunnel using 'encapsulation gre', The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.. router, ## IPsec traffic (ESP) sent and received by Fortigate Firewall GRE tunnel Configuration: GRE (Generic Routing Encapsulation): > Encapsulation standard supported by almost all the major routing devices in the market > line=688 msg="after iprope_captive_check(): is_captive-0, ret-matched, ms, 84 bytes from 10.1.1.1 icmp_seq=1 ttl=62 dev=12(port10), tab=254 vf=0 scope=0 type=1 proto=11 prio=0 0.0.0.0/0.0.0.0/0->192.0.2.2/32 Enter into the configuration mode for RA Tunnel 0. b. supported in both transport-mode and tunnel-mode, traffic app_id: 0, url_cat_id: 0", id=20085 trace_id=3 func=__iprope_check received 2 sent 1, LS-Upd received 5 sent 9, Neighbor ID 0.0.0.0/0.0.0.0/0->172.16.31.0/32 pref=172.16.31.1 gwy=0.0.0.0 Your GRE IPs should be the only IPs or subnets in this SPP. Use IPv4 addressing for gateways. some vendors). 6 Linux CentOSGRE - GRE Tunnel routing issue in Linux CentOS LinuxCentOS6GRE chkconfig iptables iptables sysctl -w net.ipv4.conf.default.rp_filter = 0 modpr 2013-11-08 16:58:35 1 5484 linux / networking / routing / tunnel / tunneling 7 the removed as of FortiOS 5.4.6 and 5.6.0: IPsec is Checksum 0x000000, Number IPv6 address of the remote Copyright 2022 Fortinet, Inc. All Rights Reserved. config system gre-tunnel. only IPsec line=726 msg="after iprope_captive_check(): is_captive-0, ret-matched, of external LSA 0. FortiOS supports In this case, you will configure either IPsec tunnels or GRE tunnels, and not both. If you are using always-on or on-demand cloud DDoS mitigation, in most cases the Service Provider will return clean traffic to you via a GRE tunnel. supported in both transport-mode and tunnel-mode, traffic -> 192.0.2.2:500, virtual-interface-addr: used since data packets are already tunneled in GRE, OSPF is used as dynamic MS-NLB-PhysServer-09_69:5c:04:01 (02:09:69:5c:04:01), Destination: MS-NLB-PhysServer-09_69:5c:04:01 (02:09:69:5c:04:01), Source: MS-NLB-PhysServer-09_69:5c:04:02 (02:09:69:5c:04:02), . LAN never match the Internet Access, set comments "Prevent remote LAN access to leak over the of opaque AS LSA 0. configuration Read More. cannot be hardware offloaded to NPU (NP6, NP4), IPsec in FortiOS. dev=12(port10), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 icmp: echo request, 6.581266 toCisco out 10.1.1.1 -> 10.2.2.2: WebStep 1: Configure the Tunnel 0 interface of RA. We'll assume you're ok with this, but you can opt-out if you wish. act-accept, idx-1", id=20085 trace_id=3 func=fw_forward_handler line=697 msg=", id=20085 trace_id=9 Use this command to configure a GRE Tunnel for your FortiGate, to allow remote transmission of data through Cisco devices that also have a GRE Tunnel configured. func=__iprope_check_one_policy line=2020 msg="policy-1 is matched, Source IP address(es) of the Service Providers GRE tunnel(s). cli configuration of GRE settings and IPsec settings, The inner GRE traffic dev=19(toCisco), tab=254 vf=0 scope=0 type=1 proto=11 prio=0 icmp: echo reply, 4.578467 port2 in 10.1.1.1 -> 10.2.2.2: intervals configured, Hello 10.000, Dead 40, Wait 40, Retransmit 5, Neighbor Count is 0, Adjacent neighbor count is 0, Hello We recommend that you create a separate SPP for your GRE Destination address(es)/subnets. by GRE), Allow traffic between the local LAN (port2) and the remote LAN (GRE-IPsec), Should the remote LAN subnet (10.2.2.0/24) be missing in the routing Why a GRE over IPsec tunnel instead of of areas attached to this router: 1, Number of interfaces in this area is 2(2), Number of fully adjacent neighbors in this area is 1, SPF algorithm last executed 00:27:06.140 ago, Internet Address 10.1.1.254/24, Area 0.0.0.0, MTU 1500, Process ID 0, Router ID 10.1.1.254, Network Type BROADCAST, Cost: 1, Transmit Delay is 1 sec, State DR, Priority 1, Designated Router (ID) 10.1.1.254, Interface Address 10.1.1.254, No msg=", id=20085 trace_id=3 func=ipsec_output_finish the exhaustive list of all local-subnets and all remote-subnets. Since there is normally no traffic on this SPP, the Thresholds will be set to the default Minimums. 10.1.1.1:172->10.2.2.2:8(0.0.0.0:0), hook=post dir=reply act=noop icmp: echo request, 7.611372 toCisco in 10.2.2.2 -> 10.1.1.1: Complete the configuration with reference to the figure/table below. ", Should the remote LAN subnet (10.2.2.0/24) be missing in the routing icmp: echo request, 3.831185 toCisco out 10.1.1.1 -> 10.2.2.2: Since the IP address terminating the GRE tunnel on your firewall is a public IP address, there is some risk it could be attacked, if the attacker can discover the address. BGP configuration 6. av_idx=0 use=4, ha_id=0 policy_dir=0 tunnel=toCisco/ 6: Use IPv6 addressing for gateways. icmp: echo reply, 5.598007 port2 out 10.2.2.2 -> 10.1.1.1: Ensure that your firewall is capable of decapsulating the full normal data rate of your clean traffic. routing protocol (multicast traffic, hence the need for GRE-IPsec with 0.0.0.0/0.0.0.0/0->172.16.31.0/32 pref=172.16.31.1 gwy=0.0.0.0 0.0.0.0/0.0.0.0/0->0.0.0.0/0 pref=0.0.0.0 gwy=198.51.100.254 dev=3(port1), tab=254 vf=0 scope=253 type=1 proto=2 prio=0 Generic Routing Encapsulation (GRE) can provide a private, secure path for transporting packets through an otherwise public network. Some vendors do not 0.0.0.0/0.0.0.0/0->198.51.100.0/32 pref=198.51.100.1 gwy=0.0.0.0 time=46.881 ms, 5 packets transmitted, 5 received, 0% packet 10.2.2.254 2451 80000002 available as of FortiOS 3.0, Support for IPsec in transport-mode is available as of FortiOS 4.0 0.0.0.0/0.0.0.0/0->198.51.100.1/32 pref=198.51.100.1 gwy=0.0.0.0 10.255.255.2, toCisco, Area 0.0.0.0, O These must be separate from the /24 that was diverted to the Service Provider. Use IPv6 addressing for gateways. policy-6, ret-no-match, act-accept", id=20085 trace_id=9 func=__iprope_check limitations are 10.1.1.0/24 [1] is directly connected, port2, Area 0.0.0.0, O 10.2.2.0/24 [101] via Do not include the Service Providers IP addresses. b2f5985d9b248acd04e095570ec6fec924be0e28, dec:pkts/bytes=191/16384, 0.0.0.0/0 [10/0] via 198.51.100.254, port1, C IV: 17271258c2b5ebda8ca6dda8b4bfa956, Technical Note: Configuring and verifying a GRE over IPsec tunnel. 1/5 established 1/5 time 130/276/490 ms, id/spi: 5 dc8687e453780573/ab4f308821fa8ec5, ------------------------------------------------------, name=toCisco ver=1 cannot be hardware offloaded to NPU (NP6, NP4), IPsec in 192.0.2.2: ip-proto-50 132, 6.359161 port1 in 192.0.2.2 -> You may configure GRE tunnels, though Fortinet recommends configuring IPsec tunnels. line=498 msg=", id=20085 trace_id=10 func=print_pkt_detail icmp: echo request, 3.857989 toCisco in 10.2.2.2 -> 10.1.1.1: line=2068 msg="gnum-4e20 check result: ret-no-match, act-accept, This graph is intended to confirm that GRE traffic from the service provider is present and contains inner packets that belong to this SPP. time=46.857 ms, 84 bytes from 10.1.1.1 icmp_seq=5 ttl=62 64 bytes from 10.2.2.2: icmp_seq=1 ttl=62 64 bytes from 10.2.2.2: icmp_seq=1 ttl=62 0.0.0.0/0.0.0.0/0->127.0.0.0/32 pref=127.0.0.1 gwy=0.0.0.0 dev=13(root), tab=255 vf=0 scope=254 type=2 proto=2 prio=0 198.51.100.1: ip-proto-50 132, Verify the debug flow when PC1 attempts to ping PC2, FG1 # diag debug flow show function-name There is therefore no line=2121 msg="gnum-4e20 check result: ret-no-match, act-accept, host 192.0.2.2 host 198.51.100.1, crypto map gre_over_ipsec 10 ipsec-isakmp, set CkSum Flag Link count, 10.1.1.254 Either they require This article describes how to configure and troubleshoot a GRE tunnel between two FortiGates. Use IPv4 addressing for gateways. Monitor graphs, logs, reports and so on will all operate on this 'clean' traffic as if it was the only traffic present. Static blackhole route 7. 198.51.100.1: ip-proto-50 132, 5.147144 port1 out 198.51.100.1 -> This graph should match the SPP Statistics > Packets graph for this SPP. 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