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zoonderkins/wireguard-vpn-cannot-surf-github-mtu-fix.md

Last active October 5, 2021 02:35
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Wireguard VPN cannot surf Github MTU fix
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wireguard-vpn-cannot-surf-github-mtu-fix.md

There are some provider have MTU issue

PhotonVPS, YardVPS

wg0.conf

[Interface]
Address = 10.8.3.1/24, fd42:42:44::1/64
ListenPort = 1723
PrivateKey = 0MpOsKxxxxomHE2g=
MTU=1430

[Peer]
# Coolbitx mbpr
PublicKey = GBDMhUbPxxxx3xqoQEg=
PresharedKey = SZWeB8xxxxhZJU=
AllowedIPs = 10.8.3.2/32, fd42:42:44::2/128

Setup eth0 MTU

ifconfig eth0 mtu 1440 up

Setup correct MTU iptables

iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
ip6tables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

References

  1. https://keremerkan.net/posts/wireguard-mtu-fixes/
  2. https://forum.openwrt.org/t/wireguard-performance/42501/6
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