Date   : Tue, 07 Aug 2001 12:16:20 +0100
From   : Tim Fardell <tim.fardell@...>
Subject: Re: BBC TCP IP Stack (OverView)

gARetH baBB wrote:
> 
> 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.

There's no *way* ICMP will be phased out! It's an integral part of any IP
implementation and carries vital control messages (network unreachable, protocol
unreachable, TTL expired.....) 

Tim. 

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