DNS Request with NodeID + Fastd-Key, prepared for reply with MTU.

ffs-set-segment/files/usr/sbin/ffs-set-segment

@@ -16,15 +16,17 @@ fi
 
 NODEID=`uci get network.bat0.macaddr | sed 's/://g'`
 PUBKEY=`/etc/init.d/fastd show_key mesh_vpn | cut -c1-12`
-SEGMENT=`nslookup ffs-$NODEID-$PUBKEY.segassign.freifunk-stuttgart.de  [::1]:54 | tail -n1`
-if [[ -z "${SEGMENT// }" ]]; then
+SEGINFO=`nslookup ffs-$NODEID-$PUBKEY.segassign.freifunk-stuttgart.de  [::1]:54 | tail -n1`
+if [ -z "$SEGINFO" ]; then
     echo Node not known
     exit 1
 fi
-SEGMENT=${SEGMENT/Address 1: 2001:2:0:711::/}
+SEGINFO=${SEGINFO/Address 1: 2001:2:0:711::/}
+VPNMTU=$(echo $SEGINFO | cut -d':' -s -f1)
+SEGMENT=$(echo $SEGINFO | cut -d':' -f2)
+
 let PORT=SEGMENT+10040
 SEGNUM=$(printf "%02d" $SEGMENT)
-
 CHANGED=0
 for i in `seq 1 10`;
 do
@@ -39,6 +41,10 @@ do
 done
 
 if [ "$CHANGED" = "1" ]; then
+    if [ -n "$VPNMTU" ]; then
+        uci set fastd.mesh_vpn.mtu="$VPNMTU"
+        echo MTU set to $VPNMTU
+    fi
     /etc/init.d/fastd restart
     echo Segment set to $SEGNUM
 fi