Cisco 515e PIX Firewall: Route only port 80 and 443 traffic

Unanswered Question

I have a PIX 515e firewall with 3 interfaces (Inside, ISP_1, ISP_2). I currently have everything routed to ISP_1 but I would like to route all Web Browsing traffic (port 80 and 443) to ISP_2 and all other traffic continue out ISP_1.


I have setup an ACL specifying all traffic going to 0.0.0.0 on port 80 and 443 to use ISP_2. But for some reason when I do that, that ACL rule reverts back to ISP_1. I am using the PIX PDM GUI.


Also, I do not have a static route defined for the ISP_2 interface, only an ACL. I am not sure how to define that route since I already have one ISP_1. Would it be somehthing like this?


<local network> <Local subnet> route to <ISP_1>

<local network> <Local subnet> route to <ISP_2>


I am not sure how the above would work. I still want all non port 80 and 443 traffic to go out through ISP_1.


Your help is appreciated.

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Collin Clark Fri, 10/24/2008 - 08:29
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I'm afraid you can't do that with a PIX. You could do it with a router and a route map.

dmooreami Fri, 10/24/2008 - 10:41
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Correct you need two firewalls.


Yes, you can route-map with a L3 cisco switch.


you would use the route map with an extended access-list to push the traffic to the specific firewall. Google "cisco route-map" for examples


Collin Clark Fri, 10/24/2008 - 10:42
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If you want to differentiate traffic flows then yes. You could use one router and connect to both ISPs and do the route map (as well as firewall services). I believe that route map support on L3 switches depends on the platform and Enhance Image IOS.

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