我统计了连续两天的访问日志，有个地方希望能指教一下

[dev4u]

我统计了连续两天ssserver产生的日志，发现只要被程序判定为：out of window，packet_id一定是0。
这个oow代表什么意思？

2022-05-17T01:44:06.936508071+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11624 packet_id 0 out of window
2022-05-17T01:44:07.677196571+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11629 packet_id 0 out of window
2022-05-17T01:44:10.906968796+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11651 packet_id 0 out of window
2022-05-17T01:44:25.318910320+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11676 packet_id 0 out of window
2022-05-17T01:44:27.002772408+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11679 packet_id 0 out of window
2022-05-17T01:44:59.732877579+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11736 packet_id 0 out of window
2022-05-17T01:46:39.524740037+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11864 packet_id 0 out of window
2022-05-17T01:46:40.617946234+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11883 packet_id 0 out of window
2022-05-17T01:46:40.972119967+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11884 packet_id 0 out of window
2022-05-17T01:46:42.166320899+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11890 packet_id 0 out of window
2022-05-17T01:47:00.561633666+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11961 packet_id 0 out of window
2022-05-17T01:47:02.388931367+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:11964 packet_id 0 out of window
2022-05-17T01:50:15.699307280+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:12242 packet_id 0 out of window
2022-05-17T01:50:20.014938472+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:12241 packet_id 0 out of window
2022-05-17T01:50:40.206483428+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:12279 packet_id 0 out of window
2022-05-17T01:50:40.216496855+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:12280 packet_id 0 out of window
2022-05-17T02:02:59.389785640+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:9353 packet_id 0 out of window
2022-05-17T02:02:59.669748655+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:9352 packet_id 0 out of window
2022-05-17T02:03:40.964988682+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:9408 packet_id 0 out of window
2022-05-17T02:03:41.066890039+08:00 ERROR shadowsocks_service::server::udprelay udp client [::ffff:*****]:9409 packet_id 0 out of window

[database64128]

Shadowsocks 2022 implements a sliding window for UDP replay protection. A sliding window only accepts a packet when its ID is in the "window" and it hasn't been seen before.

Did you build your server and client from the latest commit? If so, my guess is your network is duplicating the first packet of these UDP sessions for some reason.

[dev4u]

是的，我使用的是最新的主分支上的代码。
我用grep搜索out of window，命中的日志，都是id为0的信息。或许我应该统计一下，id为0的日志没有oow的，以便确认这是否是有潜在的问题。