Added masquerade rule when runing as gateway. Changed default MTU to 1360...

Added masquerade rule when runing as gateway. Changed default MTU to 1360 (with 1400 sometimes there are problems)

packages/gwck-qmp/patches/011-masquerade_ipv4.patch

+diff --git a/etc/gwck/gwck_conf_qmp_ipv4 b/etc/gwck/gwck_conf_qmp_ipv4
+index ed28194..ac79dc4 100644
+--- a/etc/gwck/gwck_conf_qmp_ipv4
++++ b/etc/gwck/gwck_conf_qmp_ipv4
+@@ -137,6 +137,9 @@ done
+ iface="$(ip route | grep "^default" | grep -v "bmx6_out" | sed -n -e 's/.* dev \([^ ]\+\) .*/\1/gp')"
+ if [ -n "$iface" ] && ! echo "$iface" | grep -q " "
+ then
++	log "Masquerading via iptables"
++	iptables -A POSTROUTING -t nat -o $iface -j MASQUERADE
++
+ 	log "Clamping the MSS via iptables"
+ 	iptables -I FORWARD -o $iface -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
+ fi

packages/gwck-qmp/patches/012-mtu_to_1360.patch

+diff --git a/etc/gwck/module/bmx6 b/etc/gwck/module/bmx6
+index 26a31ee..7a504f2 100644
+--- a/etc/gwck/module/bmx6
++++ b/etc/gwck/module/bmx6
+@@ -61,7 +61,7 @@ fi
+ 
+ # bmx6 tunOut mtu value.
+ [ -z "$GWCK_MOD_BMX6_MTU" ] \
+-&& GWCK_MOD_BMX6_MTU="1400"
++&& GWCK_MOD_BMX6_MTU="1360"
+ 
+ # Not disable offer if no other nodes offer Internet access.
+ [ -z "$GWCK_MOD_BMX6_TEST_OTHER_OFFER" ] \