Firewall Stateful in IOS Firewall active/active scenario

Unanswered Question
Mar 17th, 2009

Hi,

I have 2 routers 7201 wich has connectivity with various ISPs.

First router has connectivity with ISP A and ISP B1, and router B has connectivity with ISP B2, wich acts as backup of ISP B1 of router A.

These routers have configured BGP.

By default, only route from A router (it has configured HSRP in inside interface).

If ISP B1 goes down, depends on destination AS, routerA routes to ISP A, or reroute to ISP B2 (router B).

Only if router A crashes, all trafic is routed to router (ISP B2)by means of HSRP.

I have applied ACLs in WAN interface (outside), but sometimes we originate some trafic from inside interface (LAN).

To solve this issue, I use classic ip inspect.

If ISP B1 or router A goes down, inspected traffic are droped because router B has not any list with inspected packets by routerA, and ACL in ISP B2 deny traffic.

I readed about Firewall Stateful Failover, but I think I must be not configure it, because sometimes can route with 2 routers at the same time, and Stateful Failover is designed to use an active/backup scenario.

How could I configure Stateful Failover? Must I change BGP route policy?

Thank you,

I have this problem too.
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jomassanell Tue, 03/17/2009 - 15:05

I think maybe I can use multiple stateful failovers, one for link redundancy and another for router redundancy.

Is possible configure 2 out inspect rules in same interface? I would be configure 2 HSRP groups.

If this is possible, router inspects two times the same packet? Or inspects one time and push it to 2 databases?

Theses routers are connected to two Internet ISPs with a maximum troughput of 40Mbs, and I'm worried about performance and memory issues.

I have 2 Cisco 7201 with 1024 RAM with full Internet routing.

Regards.

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