3 Desintation Unreachable and all its sub types
4 Source Quench and its subtypes
11 time exceeded
12 bad header
Quoting Daniel Crichton ([EMAIL PROTECTED])
On Subject: List of "safe" ICMP types and codes
Date: Wed, Dec 27, 2000 at 03:18:14PM -0000
> Anyone know which ICMP types and codes are reasonably safe to allow
> through my firewall? I want to keep as much info hidden as possible (so
> disabling ping and tracert is a start) but also allow messages that help keep
> connections going (such as type 3 code 4 to allow a smaller MTU to be used
> for packet sizes). And I need to set these on a PIX which only appears to
> allow me to specifiy the type, not the code, for the ICMP packets to
> allow/deny - am I reading the command reference wrong, or is this the case.
>
> Dan
>
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