[FS#3231] firewall3: mtu_fix should apply mss clamping for both outgoing and incoming syn packets
openwrt-bugs at lists.openwrt.org
Fri Jul 24 20:40:57 EDT 2020
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FS#3231 - firewall3: mtu_fix should apply mss clamping for both outgoing and incoming syn packets
User who did this - Yousong Zhou (yousong)
Last time I saw this issue was when reviewing a wireguard setup. IP fragmentation
in the client->server was very frequent in the pppoe-wan interface. I think this is why the old way mostly works.
At that time I fixed it by setting a correct mtu value (16 multiples) on the local openwrt side, and having mss clamp in both directions on the remote side.
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