On 5/3/19 03:26, Mark Andrews wrote: > > >> On 5 Mar 2019, at 5:18 pm, Mark Tinka <[email protected]> wrote: >> >> >> >> On 5/Mar/19 00:25, Mark Andrews wrote: >> >>> >>> Then Cloudflare should negotiate MSS’s that don’t generate PTB’s if >>> they have installed broken ECMP devices. The simplest way to do that >>> is to set the interface MTUs to 1280 on all the servers. Why should >>> the rest of the world have to put up with their inability to purchase >>> devices that work with RFC compliant data streams. >> >> I've had this issue with cdnjs.cloudflare.com for the longest time at my >> house. But as some of you may recall, my little unwanted TCP MSS hack >> for IPv6 last weekend fixed that issue for me. >> >> Not ideal, and I so wish IPv6 would work as designed, but… > > It does work as designed except when crap middleware is added. ECMP > should be using the flow label with IPv6. It has the advantage that > it works for non-0-offset fragments as well as 0-offset fragments and > also works for transports other than TCP and UDP. This isn’t a protocol > failure. It is shitty implementations.
Not to play devil's advocate but the IETF fot to publish a spec for ECMP use of Flow Labels only a few years ago. For quite a while, they were unasable... and might still be, for some implementations. -- Fernando Gont SI6 Networks e-mail: [email protected] PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
