请问 udp2raw + wireguard，mtu应该怎么设置 #561
Description
如果wireguard的mtu设置为1420，连网后无法ping通
如果wireguard的mtu设置为1280，连网后可以ping通，传输数据的时候，udp2raw服务器端出现大量WARN信息：
[2025-10-12 03:47:02][WARN]huge packet, data_len 2772 > 1800(max_data_len) dropped, maybe you need to turn down mtu at upper level, or you may take a look at --fix-gro
[2025-10-12 03:47:05][WARN]huge packet, data_len 2772 > 1800(max_data_len) dropped, maybe you need to turn down mtu at upper level, or you may take a look at --fix-gro
[2025-10-12 03:47:06][WARN]huge packet, data_len 2772 > 1800(max_data_len) dropped, maybe you need to turn down mtu at upper level, or you may take a look at --fix-gro
[2025-10-12 03:47:10][WARN]huge packet, data_len 2772 > 1800(max_data_len) dropped, maybe you need to turn down mtu at upper level, or you may take a look at --fix-gro
[2025-10-12 03:47:15][WARN]huge packet, data_len 2772 > 1800(max_data_len) dropped, maybe you need to turn down mtu at upper level, or you may take a look at --fix-gro
[2025-10-12 03:47:16][WARN]huge packet, data_len 2772 > 1800(max_data_len) dropped, maybe you need to turn down mtu at upper level, or you may take a look at --fix-gro
我看网上说要将wireguard的mtu设置为1200，但是我试了最低只能设置到1280，再低的话wireguard就启动不了。