7 Sep
2026
7 Sep
'26
8:29 a.m.
On Mon, 7 Sept 2026 at 10:55, Saku Ytti <saku@ytti.fi> wrote:
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.
I seem to have outdated information, most or all(?) have returned to 1460 cap. Largely due to PPPoE density getting lower, combined with PLPMTUD. https://blog.cloudflare.com/client-dynamic-path-mtu-discovery/ -- ++ytti