2 ms·
Nothing about PMTUD?
by cryptonector 3y ago
Nothing about PMTUD?
- zamadatix 3y agoFor TCP sockets I'd rather just MSS clamp on the internet gateway. On top of too many things just dropping PMTUD, enabling it results in a slower process while MSS clamping hijacks the initial TCP open messages directly.
- cryptonector 3y agoThere's PMTUD that doesn't depend on ICMP.
- zamadatix 3y agoFor TCP in Linux the only thing I know of is net.ipv4.tcp_mtu_probing=2 which is still slower than clamping at the edge. You can also run into weird slowdowns in cases with packet loss even after the initial discovery. If you don't have a way to clamp but absolutely need the interface to have jumbo enabled for local traffic performance it's probably the best fallback but even then I'm not sure it's worth the extra headache it causes.
- toast0 3y agoFWIW, I put together a PMTUD test site you might find interesting http://pmtud.enslaves.us/ http://pmtud.enslaves.us/
- cryptonector 3y agoNice URL!