Change the clamp-mss rule for bmx6 from x6+ for bmx+

Adds mss-clamping=1 to the openwrt firewall configuration

packages/qmp-system/files/etc/qmp/qmp_gw.sh

@@ -131,6 +131,7 @@ qmp_gw_masq_wan() {
 		qmp_uci_set_cfg firewall.$cfg.forward=ACCEPT
 		qmp_uci_set_cfg firewall.$cfg.name=wan
 		qmp_uci_set_cfg firewall.$cfg.masq=$masq
+		qmp_uci_set_cfg firewall.$cfg.mtu_fix=1
 		qmp_uci_commit firewall
 
 	else
@@ -139,6 +140,7 @@ qmp_gw_masq_wan() {
 		qmp_uci_set_raw firewall.@zone[$wan].output=ACCEPT
 		qmp_uci_set_raw firewall.@zone[$wan].forward=ACCEPT
 		qmp_uci_set_raw firewall.@zone[$wan].masq=$masq
+		qmp_uci_set_raw firewall.$cfg.mtu_fix=1
 		cfg=@zone[$wan]
 	fi
 

packages/qmp-system/files/etc/uci-defaults/qmp_clamp_tcpmss

@@ -24,11 +24,11 @@
 #
 
 # Update the clamp MSS TCP rule to new interface name of bmx6 with tunnels on-demand.
-sed -i -e "s/^iptables -A FORWARD -p tcp -o bmx6_+ -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu$/iptables -A FORWARD -p tcp -o x6+ -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu/g" /etc/firewall.user
+sed -i -e "s/^iptables -A FORWARD -p tcp -o bmx6_+ -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu$/iptables -A FORWARD -p tcp -o bmx+ -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu/g" /etc/firewall.user
 
 if grep -q -e "^# Clamp MSS TCP rule to fix MTU problems" /etc/firewall.user; then exit 0; fi
 
 cat << EOF >> /etc/firewall.user
 # Clamp MSS TCP rule to fix MTU problems
-iptables -A FORWARD -p tcp -o x6+ -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
+iptables -A FORWARD -p tcp -o bmx+ -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
 EOF