fix pppoe mtu

files/ppp-post-scripts/postdown.sh.j2

@@ -3,15 +3,8 @@ source {{ansible_user_dir}}/nextgen-router/scripts/utility.sh
 
 INIT_ID=$[1000 + $(echo "$PPP_IFACE" | sed "s/ppp//g")]
 
-INTERFACE_MTU=$(ip link show dev "$PPP_IFACE" | grep -oP 'mtu \d+' | cut -c 5-)
-
-INTERFACE_MTU_4=$[INTERFACE_MTU - 40]
-INTERFACE_MTU_6=$[INTERFACE_MTU - 60]
-
-iptables -t mangle -D FORWARD -o "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_4:1460 -j TCPMSS --set-mss $INTERFACE_MTU_4
-iptables -t mangle -D FORWARD -i "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_4:1460 -j TCPMSS --set-mss $INTERFACE_MTU_4
-ip6tables -t mangle -D FORWARD -o "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_6:1460 -j TCPMSS --set-mss $INTERFACE_MTU_6
-ip6tables -t mangle -D FORWARD -i "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_6:1460 -j TCPMSS --set-mss $INTERFACE_MTU_6
+iptables-save | grep -- '-j TCPMSS' | grep -- "$PPP_IFACE" | sed 's/^-A/-D/g' | xargs -I '{}' bash -c 'iptables -t mangle {}'
+ip6tables-save | grep -- '-j TCPMSS' | grep -- "$PPP_IFACE" | sed 's/^-A/-D/g' | xargs -I '{}' bash -c 'ip6tables -t mangle {}'
 
 iptables -t nat -o "$PPP_IFACE" -D POSTROUTING -j MASQUERADE