[nsp] AS5300 loosing memory

Niels Bakker niels=cisco-nsp at bakker.net
Sat Aug 23 01:07:22 EDT 2003

* coldiso at houx.org (Jason Houx) [Fri 22 Aug 2003, 23:20 CEST]:
> We created an acl like this {see below} and applied it to every one of our
> AS5248's - our AS5350, AS5400, and AS5396 did not seem to have near the
> access-list 199 deny   icmp any any
> access-list 199 permit ip any any  

That's stupid.  ICMP is an important part of the Internet Protocol, and
by blocking it you break a lot of things - Path MTU Discovery, to name
one - and make connection attempts to closed ports take ages to time out
rather than almost instantaneously, to name but two problems instigated
by your overzealous access-list.

	-- Niels.

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