Restricting ICMP

[Mark]

----- Original Message ----- 
From: "Mark" <admin at asarian-host.net>
To: <freebsd-questions at freebsd.org>
Sent: Tuesday, August 12, 2003 2:23 AM
Subject: Restricting ICMP


> Hello,
>
> Is there a way I can use ipfw to disallow ICMP from anyone, but
> root? (FreeBSD 4.7R) I tried this:
>
> ${fwcmd} -q add 4 allow icmp from any to any icmptype 0,3,8,11 in
> via ${outside}
> ${fwcmd} -q add 4 allow icmp from any to any uid root
> ${fwcmd} -q add 4 deny log icmp from any to any
>
> But that, obviously, does not do what I want it to, as it keeps
> denying everything going out. It may not even be possible to
> restrict ICMP that way, but it never hurts to ask. :)

Sorry for the addendum; but I was not entirely clear. I want to restrict
*outgoing* ICMP (traceroute and such) to anyone, but root.

- Mark