Date   : Tue, 07 Aug 2001 11:17:24 +0100 (BST)
From   : gARetH baBB <hick@...>
Subject: Re: BBC TCP IP Stack (OverView)

On Sat, 4 Aug 2001, Chris Thornley wrote:

> ICMP a basic protocol used mainly for diagnostic purposes i.e. PING echo and
> machine detection. Is being phased out due to potential security problems
> and is usually blocked by firewalls giving the impression the machine not
> there.

Anyone who blocks all of ICMP off is asking for trouble - you'd lose MTU
discovery for a start.