iptables -t mangle -A FORWARD -i wg+ -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
iptables -t mangle -A POSTROUTING -o wg+ -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
rc-service iptables save
ip6tables -t mangle -A FORWARD -i wg+ -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
ip6tables -t mangle -A POSTROUTING -o wg+ -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
rc-service ip6tables save