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North American Network Operators Group

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Re: management interface accessability (was Re: Worm / UDP1434)

  • From: E.B. Dreger
  • Date: Sun Jan 26 16:25:45 2003

RT> Date: Sun, 26 Jan 2003 15:07:41 -0600 (CST)
RT> From: Rob Thomas

RT> This is yet another reason why I tell folks with firewalls
RT> NOT to allow everything from the internal (often mistakenly
RT> labelled "trusted") net to the external nets.

Too true.  However, when a company president gets upset because
his kid couldn't play Quake over the network, ports magically
begin to open...

FWIW, it might be good to clarify the "stateful" remark a bit:
Keeping state on all outbound traffic could cause a problem.

	deny udp from any 1434 to any 1434
	allow udp from any 1434 to any keep-state
	deny udp from any to any 1434

works nicely for blocking the worm.

Brotsman & Dreger, Inc. - EverQuick Internet Division
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Date: Mon, 21 May 2001 11:23:58 +0000 (GMT)
From: A Trap <>
Subject: Please ignore this portion of my mail signature.

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