Setting up WAN routing for two external ip blocks

jplowick3 · ‎12-07-2009

I'm trying to install a new internet connection from a different ISP. In the process we are also getting a new external IP subnet. I would like to be able to route traffic on the new subnet via the new connection and anything on the old IP subnet through the old connection. I tried setting up a route-map to catch traffic on the the F0/0 interface from the new subnet IP range and send it out F0/1. I can see traffic matches for the access-list, but traffic doesn't appear to be routed correctly (can't ping anything outside). The default route points out the Multilink1 interface. I need to be able to route both of our external subnet ranges so we can transition over our devices from one WAN connection to the other.

Am I missing something? Is there a better way to accomplish this?

Here are the basics of my config:

interface multilink1

desc 2xT1 WAN link (old ISP 1)

ip address 65.xxx.85.74 255.255.255.252

interface f0/0

desc LAN interface

ip address 65.xxx.251.162 255.255.255.224

ip address 12.yyy.245.1 255.255.255.224 secondary (new subnet)

interface f0/1

desc 20MB metro-ethernet (new ISP 2)

ip address 12.zzz.104.206 255.255.255.252

ip route 0.0.0.0 0.0.0.0 65.xxx.85.73

access-list 150 remark Match all traffic from new subnet

access-list 150 permit ip 12.yyy.245.0 0.0.0.31 any

route-map 20MB-opteman permit 150

match ip address 150

set interface FastEthernet0/1 (also tried "set ip next-hop 12.116.105.205")

interface FastEthernet0/0

ip policy route-map 20MB-opteman

Jon Marshall · ‎12-07-2009

jplowick3 wrote:

I'm trying to install a new internet connection from a different ISP. In the process we are also getting a new external IP subnet. I would like to be able to route traffic on the new subnet via the new connection and anything on the old IP subnet through the old connection. I tried setting up a route-map to catch traffic on the the F0/0 interface from the new subnet IP range and send it out F0/1. I can see traffic matches for the access-list, but traffic doesn't appear to be routed correctly (can't ping anything outside). The default route points out the Multilink1 interface. I need to be able to route both of our external subnet ranges so we can transition over our devices from one WAN connection to the other.