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 Junk-Mail bitte an trashcan@stinkedores.dorfdsl.de _______________________________________________ NANOG mailing list https://lists.nanog.org/archives/list/nanog@lists.nanog.org/message/4CCLKQVM...