PIX internal to external icmp

Posted on 2006-03-29
Last Modified: 2013-11-29
Hi experts,

An easy one here:

I get no respose from my PIX's external interface when I ping it from the internal network - I can however ping the internet from the internal network . Is this normal behaviour of PIX - is it a limitation of NAT or is something up with my PIX?

Question by:Ciderspine
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    Expert Comment

    It's probably blocking the ICMP protocol used by PING and TRACERT. If you enable that in the PIX, you should be able to ping it.
    LVL 1

    Expert Comment

    D'OH! I just noticed you said you can ping the internet... :)

    I checked and it looks like it's a limitation of NAT - the external interface can't respond to a request from it's own internal interface.

    Author Comment

    Thanks uter,

    Yes, I do have ICMP rules. I just want to be sure that it's normal and not something in the way I've configured PIX. Where did you get the info from?

    I can ping both interfaces from the PIX (ie - in a telnet session.)

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