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Re: icmp rpf
- From: Adrian Chadd
- Date: Mon Sep 25 09:24:51 2006
On Mon, Sep 25, 2006, Ian Mason wrote:
> Filtering ICMP is always dangerous. If you are going to do it you
> *must* understand the consequences both to yourself and to others,
> and also understand the consequences in both normal situations and
> all possible failure modes. (If I had a penny for every broken PMTU
> detection I'd seen because of someone's over eager filtering of ICMP...)
Is there a BCP for "handling ICMP?"
I'm walking the Cisco certification path and they're quite vocal about
ICMP rate limiting over any kind of filtering on routers/switches.
I haven't read their firewall documentation so I'm not sure what they're
preaching for PIX/ASA.
(Yup, if I had a penny for every PMTU fix-by-unbreaking-ICMP-filtering
I've repaired over the last 10 years..)
Adrian
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