Multiple WANs from Different ISPs: Forcing session thru same interface/ISP?
I have 3 WAN connections: 1 T-1 and 2 ADSLs each from different ISPs and different public addresses.
All are connected to the same 2801 router through a WIC-1T, Fa0/0 and Fa0/1 respectively.
1) When I ping from the Internet to one of the interfaces, the reply packet sometimes goes through a different interface, hence different ISP. How can I force the return packet to go through the same interface that received it?
2) Related to (1), when I SSH to the router from the outside, I get a slow/disrupted connection since the reply packets goes through another interface. This problem gets solved when I set a static route to the client SSH. Of course, this is not the optimal solution.
There are other issues (multiple NAT pools not working because sessions don't go through the same ISP) but I'll with this simpler problem first.
I configured the static routes as:
ip route 0.0.0.0 0.0.0.0 a.a.a.a (ISP 1)
ip route 0.0.0.0 0.0.0.0 b.b.b.b (ISP 2)
ip route 0.0.0.0 0.0.0.0 c.c.c.c (ISP 3)
In summary, what should I do to force egress packets out the same interface as their same-session ingress packets?
Re: Multiple WANs from Different ISPs: Forcing session thru same
Cisco routers source their packets with the address assigned to the interface nearest to the destination. So, when you ping or SSH to the "outside" address, you are not matching your NAT ACL as it's ip is not in the 10.x.x.x range...
That being said, chances are, it won't match as the path doesn't cross thru an interface with "ip nat inside".
My suggestion. Create 3 loopback interfaces with ip nat inside. Create static nat translations to point them so you know which ISP link you came down.. I think this will also create a state xlate in the nat table (use show ip nat trans to see the entries).
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