xbox 测试多人连线时丢包 100%

[pexcn]

现象：
使用 v1.15.0-alpha.8 时, 在 xbox 测试多人连线的时候会连不通，显示丢包 100%. 请问是 ss-rust 不支持 FULLCONE NAT 的问题吗？

补充：
在使用 v1.14.3 的时候，在服务端做了以下设置是能通过 xbox 的多人连线测试的；但是同样的设置，在 v1.15.0-alpha.8 却不行。

echo 1 > /proc/sys/net/ipv4/ip_no_pmtu_disc

[pexcn]

关联 issue: shadowsocks/shadowsocks-libev#361

[zonyitoo]

It is fullcone NAT. You can verify that in code.

[database64128]

This test probably tests some edge cases with large packets. Your multiplayer games should play just fine. Just ignore the test result. And don't mess with sys/net/ipv4/ip_no_pmtu_disc.

Your issue is related to commit be518ce, which was requested by me. Disabling IP fragmentation ensures that protocols using DPLPMTUD can probe the correct MTU, which is crucial for throughput and latency, since fragmented IP packets can be flaky over the Internet.

[zonyitoo]

I tried with Nintendo's Switch, and it showed NAT Type: A, which is Fullcone.

[pexcn]

感谢各位大佬解答😁，我决定把 ip_no_pmtu_disc 关闭了

[pexcn]

具体忘记了，保持系统的默认设置就行，显示100%丢包实际不影响使用