Security Basics: Re: ICMP (Ping)

[andreas <entmoot () gmx de>]

On Tue Sep 02  03:19PM, Paul Kurczaba wrote:
> Are there any security issues for allowing a firewall/router to respond to
> Ping from the internet?
>
> -Paul Kurczaba
I don't know, if it was mentioned in one of the other replies, but there
is also a technique known to portscan hosts behind a firewall by
allowing icmp code 3 replies (Port unreachable) using a specially
crafted TTL field.

regards, andreas



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