RE: IPv4 flag day

[Gary Sparkes via NANOG <nanog () lists nanog org>]

I can't think of any reason to block any of these (dest unreach, echo req/rep, timeout exceed, or pkt too large) 


-----Original Message-----
From: Marco Moock via NANOG <nanog () lists nanog org> 
Sent: Friday, June 19, 2026 10:36 AM
To: nanog () lists nanog org
Cc: Marco Moock <mm () dorfdsl de>
Subject: Re: IPv4 flag day

Am 19.06.26 um 05:30 schrieb Gary Sparkes via NANOG:
> For ICMP, we really only need timeout exceeded and echo request/reply, packet too large isn't required (and that's 
> what breaks PMTU) nor is dest unreach.

Are there any reason to block ICMP dest unreachable?

I never saw one.

Breaking PMTU is a PITA - for both IPv6 and IPv4.

--
Gruß
Marco

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