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9.2

LAN traffic with different return route...can ping but that's it.

Asked by ITDharam in Networking Hardware Firewalls, Network Switches & Hubs, Cisco PIX Firewall

I doing some work for a company that is doing a gradual migration to a new ISP.  To facilitate this we installed an additional router.  Since all the LAN traffic points to the core switch, and the core switch default route is the PIX, and the PIX can only point to one gateway, I instead installed the new router (with full FW capabilities) on their local network.  To get devices to use it (since I have multiple VLANs and I couldn't configure the new router with an interface in each VLAN) I use PBR on the core switch to change the next hop to the new router.

This works fine.

Now I'm trying to migrate servers in their DMZ and right now the approach I'm taking is to plug in a secondary interface on the new router, into the DMZ switch.  So there are two 'gateways' for the DMZ, the PIX (old) and the HP (new).

My test workstation which is pointed to the HP using PBR, can access devices in the DMZ that have their gateway set to the HP.  However, my workstation has problems connecting to devices on the DMZ that are configured to point to the PIX.  I can ping these devices fine, and they can ping me, but I can't do anything else.  (At first I could ping them, but they couldn't ping me, and I found that I had to set the firewall rule to 'stateless' and then they could ping me)

I know this is vague, and if I need to provide more detail I will, but I'm really just hoping for a reality check.  From what I remember, there is no inherent problem in having a return route different from the sent route.

(One thing that confused me is that the PBR says that if you match this address, would it change the next hop address if the return traffic destination is that address?)  I tried to use an extended ACL with PBR, but it seemed to cause problems, so I'm just using a basic ACL (On Catalyst 6509)
[+][-]07/04/09 11:34 AM, ID: 24777631Accepted Solution

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Zones: Networking Hardware Firewalls, Network Switches & Hubs, Cisco PIX Firewall
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Solution Provided By: asavener
Participating Experts: 1
Solution Grade: A
 
[+][-]07/06/09 08:51 AM, ID: 24786423Author Comment

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[+][-]07/06/09 12:07 PM, ID: 24788218Expert Comment

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