If the vps network card is not eth0, modify it to the actual network card

wireguard-install.sh

@@ -131,8 +131,8 @@ cat <<EOF >wg0.conf
 [Interface]
 PrivateKey = $(cat sprivatekey)
 Address = 10.0.0.1/24,  ${ipv6_range}1/64
-PostUp   = iptables -I FORWARD -i wg0 -j ACCEPT; iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT; ip6tables -I FORWARD -i wg0 -j ACCEPT; ip6tables -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; ip6tables -D FORWARD -i wg0 -j ACCEPT; ip6tables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+PostUp   = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -A FORWARD -o wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE; ip6tables -A FORWARD -i wg0 -j ACCEPT; ip6tables -A FORWARD -o wg0 -j ACCEPT; ip6tables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
+PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -D FORWARD -o wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE; ip6tables -D FORWARD -i wg0 -j ACCEPT; ip6tables -D FORWARD -o wg0 -j ACCEPT; ip6tables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
 ListenPort = $port
 DNS = 8.8.8.8, 2001:4860:4860::8888
 MTU = $mtu
@@ -191,6 +191,11 @@ EOF
     cat /etc/wireguard/wg_${host}_$i.conf | qrencode -o wg_${host}_$i.png
 done
 
+# If the vps network card is not eth0, modify it to the actual network card
+ni=$(ls /sys/class/net | awk {print} | grep -e eth. -e ens. -e venet.)
+if [ $ni != "eth0" ]; then
+    sed -i "s/eth0/${ni}/g"  /etc/wireguard/wg0.conf
+fi
 
 # restart WG server
 wg-quick down wg0