Re: Charging for IPs

[Saku Ytti via NANOG <nanog () lists nanog org>]

On Mon, 7 Sept 2026 at 10:53, Gary Sparkes <gary () kisaracorporation com> wrote:

> I was not aware that much (if any?) IPv4 code cared about PMTUD - I thought that only  gained provenance in IPv6
>
> Outside of setting DF I guess? But I've had no issues with it, but I only accept/transit 1500 MTU so perhaps I don't 
> see an issue where one might exist

You don't have any issue with it, because it's systematically broken
because of hacks like RFC1918 and firewalls.

CDNs don't use MSS 1460, because it works so poorly. So we are leaving
performance on the table, due to PMTUD being too broken.

-- 
  ++ytti
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