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Traceroute is not working through the PIX 500 Series Firewall

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What is traceroute?


Traceroute is a command that shows you the route over the network between two systems,showing the intermediate routers or hops.It also shows you how systems are connected to each other, letting you see how your ISP connects to the Internet.

Linux:

traceroute x.x.x.x

Windows:

tracert x.x.x.x


Core issue

This can happen if icmp and icmp error inspection are not enabled in the PIX Firewall.

Resolution

In order to resolve this issue, configure icmp and icmp error inspection in the PIX Firewall as this example command output shows:

hostname(config)#policy-map global_policy

hostname(config-pmap)#class inspection_default

hostname(config-pmap-c)#inspect icmp

hostname(config-pmap-c)#inspect icmp error

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