From: alsontra@hotmail.com
Date: Wed Apr 07 2004 - 01:38:17 GMT-3
Group,
I am working with BGP and NAT trying to reproduce a problem described in the
"CCIE warm-up" exercises inwhich NAT causes a BGP peering session to drop. As
I understand it all that is needed to reproduce this problem is to include the
outside interface in the NAT source-list. I understand that disallowing the
outside interface from the NAT source-list fixes the problem, but I'd like to
work through the scenario.
topology -
R5 is in AS500 and peers with R3's Ethernet interface. R3 is (AS300) and peers
with R5 Ethernet interface. NAT is enabled on R5 e0/0
----R5(int E0/0)-----------(E0/0)R3
R5#sh run | b bgp
router bgp 500
no synchronization
bgp router-id 150.1.5.5
bgp log-neighbor-changes
neighbor 180.1.1.3 remote-as 300
no auto-summary
!
ip nat inside source list 1 interface Ethernet0/0 overload
!
interface Ethernet0/0
ip address 180.1.1.5 255.255.255.0
ip nat outside
service-policy output ICMP
half-duplex
standby 1 ip 180.1.1.254
standby 1 track Serial0/2
!
R3
!
interface Ethernet0/1
ip address 180.1.1.3 255.255.255.0
half-duplex
router bgp 300
no synchronization
bgp router-id 223.1.1.3
bgp log-neighbor-changes
network 3.3.3.0 mask 255.255.255.0
network 3.4.4.0 mask 255.255.255.0
neighbor 180.1.1.5 remote-as 500
no auto-summary
Alsontra-
This archive was generated by hypermail 2.1.4 : Mon May 03 2004 - 19:48:44 GMT-3