1/12/2024 0 Comments Fortigate loopback nat![]() Sent 4574 messages, 0 notifications, 0 in queueįoreign host: 10.142.0.110, Foreign port: 11663īGP table version is 9, local router ID is 10.0.0.2 Received 4595 messages, 0 notifications, 0 in queue Last read 00:00:15, hold time is 180, keepalive interval is 60 seconds Sent 4562 messages, 0 notifications, 0 in queueįoreign host: 10.0.0.3, Foreign port: 179īGP neighbor is 10.142.0.110, remote AS 1, local AS 1000, external link Received 4559 messages, 0 notifications, 0 in queue Last read 00:00:04, hold time is 180, keepalive interval is 60 seconds I - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2Į1 - OSPF external type 1, E2 - OSPF external type 2 Network Next Hop Metric LocPrf Weight PathįGT_ISP # get router info routing-table allĬodes: K - kernel, C - connected, S - static, R - RIP, B - BGP Origin codes: i - IGP, e - EGP, ? - incomplete Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, Route map for incoming advertisements is *1root Minimum time between advertisement runs is 30 secondsĬommunity attribute sent to this neighbor (both) Route refresh request: received 0, sent 0 Sent 4547 messages, 0 notifications, 0 in queue Received 4529 messages, 0 notifications, 0 in queue Route refresh: advertised and received (old and new)Īddress family IPv4 Unicast: advertised and received ![]() Last read 00:00:10, hold time is 180, keepalive interval is 60 secondsĬonfigured hold time is 180, keepalive interval is 60 seconds Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcdġ0.142.0.74 4 1000 4528 4546 1 0 0 2d18h02m 1īGP neighbor is 10.142.0.74, remote AS 1000, local AS 1, external link Note : Further information about OSPF can be found in related articles.īGP router identifier 10.0.0.1, local AS number 1 The verification steps will show the BGP and OSPF neighbours’ state and the routes in the routing table. Only the relevant configuration parts to this case study are given. To enable all interfaces with a single setting you can use the prefix “0.0.0.0 0.0.0.0” ![]() To enable OSPF on an interface, you only need to add it into the prefix list. Note that using a loopback interfaces requires the configuration of appropriate firewall policies that allow traffic to it. Using loopback interface allows having an IP address that does not depend on a physical interface, hence is always up. It is also used within the Customer network for the iBGP peering. The use of loopback interfaces into this BGP/OSPF design is a simple rule that eases the OSPF troubleshooting and administration, where we will set the OSPF router ID identically to the loopback interface. Note: all requirements, addresses and network information above are only given as examples for this case study. Customer uses OSPF as its IGP to advertise the loopback interface internally and allow BGP peering.The ISP should only learn the DMZ network from the Customer, 10.160.0.0/23.iBGP peering is done via loopback interfaces (*).FGT-1 and FGT-2 learn all BGP routes advertised by the ISP’s router FGT-ISP.FGT-ISP acts as the ISP router it advertises to FGT-1 all BGP routes it does learn from the Internet (In this example, only 1.0.0.0/8 and 2.0.0.0/8 are used as routes advertised by the ISP).The following network diagram illustrates this case study: It includes the network diagram, requirements, configuration, and verification steps for all FortiGates used in this example. This article describes the steps to configure FortiGates in a BGP scenario which involves iBGP, eBGP peering, OSPF as IGP for the Customer network, and an access-list to filter routes in.
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