Lower vpn MTU from 1426 to 1312 because of DS-Lite connections. See thread on...

Lower vpn MTU from 1426 to 1312 because of DS-Lite connections. See thread on developer mailinglist "Änderung der MTU für DS-Lite Anschlüsse"

Signed-off-by: Clemens John <clemens.john@floh1111.de>

site.conf

@@ -39,7 +39,7 @@
 
 	fastd_mesh_vpn = {
 		methods = { 'salsa2012+gmac' },
-		mtu = 1426,
+		mtu = 1312,
 		backbone = {
 			limit = 2,
 			peers = {