Update README.md

新增IPv6防火墙规则。

Wireguard/README.md

@@ -119,4 +119,7 @@ PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -D FORWARD -o wg0 -j A
 PostUp   = iptables -I FORWARD -i wg0 -j ACCEPT; iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
 PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
 
+# 原来的IPv6 iptables 防火墙规则
+PostUp   = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -A FORWARD -o wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o ens3 -j MASQUERADE; ip6tables -A FORWARD -i wg0 -j ACCEPT; ip6tables -A FORWARD -o wg0 -j ACCEPT; ip6tables -t nat -A POSTROUTING -o ens3 -j MASQUERADE
+PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -D FORWARD -o wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o ens3 -j MASQUERADE; ip6tables -D FORWARD -i wg0 -j ACCEPT; ip6tables -D FORWARD -o wg0 -j ACCEPT; ip6tables -t nat -D POSTROUTING -o ens3 -j MASQUERADE
 ```