troubleshooting Question

PIX 501 fails to connect to ISP through wireless router

Avatar of sara_bellum
sara_bellumFlag for United States of America asked on
Software FirewallsCisco
25 Comments3 Solutions610 ViewsLast Modified:
Here is my network topology:

  DSL ---->  Linksys Wireless Router ----->     PIX 501              -------> PC2 (192.168.x.z)
bridge          (eth0)         (eth1)                 (eth0)     (eth1)
mode          192.168.x.y
                           is the fixed IP address assigned by my ISP for the PPPoE connection, which is now hosted on the wireless router.  The PIX can connect to the wireless router (eth1) at, but it doesn't get an icmp reply from the router's outside address at unless I:
a) specify the outside interface of the PIX in my ping request or
b) add a route to in the PIX config file  
When I add a route to, the PIX can ping in the usual way and get a response, but it gets no icmp reply from the ISP gateway at, even after I add an additional route to the gateway.

Here are the relevant parts of my current PIX config, which is running Version 6.3(4) IOS:

global (outside) 1 interface
nat (inside) 1 192.168.x.0 0 0
nat (inside) 1 0 0
static (inside,outside) 192.168.x.1 netmask 0 0
static (inside,outside) 192.168.x.2 netmask 0 0
access-group acl_out in interface outside
access-group acl_in in interface inside
route inside 192.168.x.y 0
route outside 1

The ACLs aren't a problem at this point, but I'm not sure if I have icmp configured corrrectly so here goes:
access-list acl_in permit icmp any any echo
access-list acl_out permit icmp any any echo-reply

pix1# show route
      inside 192.168.x.y 0 OTHER static
      outside 1 OTHER static
      inside 192.168.x.0 192.168.x.y 1 CONNECT static
      outside 1.2.6.z 1 CONNECT static

I'm trying to connect to my ISP/the Internet through the PIX and cannot...the PIX was working fine earlier when it hosted the PPPoE connection, but that's not practical any more, since I need part of my network to connect directly to the ISP, and part of it must remain behind the PIX firewall.  How do I fix this?

Tim Holman

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