BGP Connectivity problem across WAN (FR)

[mjae]

Hi all,

I have done a sample bgp configuration at r1r2.com. My network setup is as follows:

TFTP_Server-----(e0)r1(s0)------(s0)r2

s0 = 192.168.100.0/24 (.1 for r1, .2 for r2) and e0 = 10.1.4.1/24.

The problem is that while I can ping the TFTP server (10.1.4.3 from Rtr1's e0 interface), I can't ping from r2, or from r1's s0 interface.

Here are the configs (I give more if needed)

r1#sh ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default

U - per-user static route, o - ODR

Gateway of last resort is not set

C 192.168.200.0/24 is directly connected, Loopback0

10.0.0.0/24 is subnetted, 1 subnets

C 10.1.4.0 is directly connected, Ethernet0

C 192.168.100.0/24 is directly connected, Serial0

r1#sh ip bgp

BGP table version is 2, local router ID is 192.168.100.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 10.1.4.0/24 0.0.0.0 0 32768 i

r2#sh ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default

U - per-user static route, o - ODR

Gateway of last resort is not set

C 192.168.201.0/24 is directly connected, Loopback0

10.0.0.0/24 is subnetted, 1 subnets

B 10.1.4.0 [200/0] via 192.168.100.1, 01:18:32

C 192.168.100.0/24 is directly connected, Serial0

r2#sh ip bgp

BGP table version is 2, local router ID is 192.168.100.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*>i10.1.4.0/24 192.168.100.1 0 100 0 i

I have no ACLs configured on any interfaces.

TIA,

Matthew.

[bbranch · Accepted solution]

Have you checked the default gateway on your TFTP server, I would suspect that the server does not have a route back to the R1 or R2 S0 network as the routing in R1 & R2 looks fine.

[mjae]

unfortunately I do not have access to the TFTP server, but I think the suggestion you made is 99% likely to be the answer (and definately something to check out).

Thx for your help.