On Sat, 16 Oct 2004 [EMAIL PROTECTED] wrote:
> > > Most routers will regard any ICMP request to them as a low priority
> issue.
> >
> > do they? icmp is not only about 'echo'. there's lot of
> > other functions via type/code - fragmentation, mtu etc,
> > vital for traffic signalization. administrators, who
> > blindly closes all icmp traffic are plain stupid idiots.
>
> Lots 'o flame but no light.
>
> How about sharing your knowledge of why certain icmp traffic should be
> allowed and the risks associated with allowing that traffic?
Just to name one: Path MTU discovery (RFC 1191)
This memo describes a technique for dynamically discovering the
maximum transmission unit (MTU) of an arbitrary internet path. It
specifies a small change to the way routers generate one type of ICMP
message.
Hugo.
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