removed mtu glue, added avoidance of duplicate IPv6 Node Address on changing...

removed mtu glue, added avoidance of duplicate IPv6 Node Address on changing segment. Prepared for additional info in DNS-Response.

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

 #!/bin/sh
-if [  $(ps | grep -c "{$(basename $0)}") -gt 4 ]; then
-    echo started twice
-    exit 1
+if [ $(ps | grep -c "{$(basename $0)}") -gt 4 ]; then
+  echo started twice
+  exit 1
 fi
-
-if [  $(ps | grep -c "fastd") -lt 2 ]; then
-    echo fastd not running
-    exit 0
+if [ $(ps | grep -c "fastd") -lt 2 ]; then
+  echo fastd not running
+  exit 0
 fi
-
 if [ "$(uci get fastd.mesh_vpn_backbone.auto_segment)" = "0" ]; then
-    echo auto_segment disabled
-    exit 0
-fi 
+  echo auto_segment disabled
+  exit 0
+fi
 
-NODEID=`uci get network.bat0.macaddr | sed 's/://g'`
-PUBKEY=`/etc/init.d/fastd show_key mesh_vpn | cut -c1-12`
-SEGINFO=`nslookup ffs-$NODEID-$PUBKEY.segassign.freifunk-stuttgart.de  [::1]:54 | tail -n1`
+NODEID=$(uci get network.bat0.macaddr | sed 's/://g')
+PUBKEY=$(/etc/init.d/fastd show_key mesh_vpn | cut -c1-12)
+SEGINFO=$(nslookup ffs-$NODEID-$PUBKEY.segassign.freifunk-stuttgart.de  [::1]:54 | tail -n1)
 if [ -z "$SEGINFO" ]; then
-    echo Node not known
-    exit 1
+  echo Node not known
+  exit 1
 fi
 SEGINFO=${SEGINFO/Address 1: 2001:2:0:711::/}
-NEWMTU=$(echo $SEGINFO | cut -d':' -s -f1)
 SEGMENT=$(echo $SEGINFO | cut -d':' -f2)
 
 let PORT=SEGMENT+10040
@@ -30,27 +27,21 @@ SEGNUM=$(printf "%02d" $SEGMENT)
 CHANGED=0
 for i in `seq 1 10`;
 do
-    GW=$(printf "gw%02d" $i)
-    OLDPEER=`uci get fastd.mesh_vpn_backbone_peer_$GW.remote`
-    NEWPEER="\"${GW}s$SEGNUM.freifunk-stuttgart.de\" port $PORT"
+  GW=$(printf "gw%02d" $i)
+  OLDPEER=$(uci get fastd.mesh_vpn_backbone_peer_$GW.remote)
+  NEWPEER="\"${GW}s$SEGNUM.freifunk-stuttgart.de\" port $PORT"
 
-    if [ "$NEWPEER" != "$OLDPEER" ]; then
-        uci set fastd.mesh_vpn_backbone_peer_$GW.remote="$NEWPEER"
-        CHANGED=1
-    fi
+  if [ "$NEWPEER" != "$OLDPEER" ]; then
+    uci set fastd.mesh_vpn_backbone_peer_$GW.remote="$NEWPEER"
+    CHANGED=1
+  fi
 done
 
-if [ -n "$NEWMTU" ]; then
-    OLDMTU=`uci get fastd.mesh_vpn.mtu`
-    if [ "$NEWMTU" != "$OLDMTU" ]; then
-        uci set fastd.mesh_vpn.mtu="$NEWMTU"
-        CHANGED=1
-    fi
-fi
-
 if [ "$CHANGED" = "1" ]; then
-    /etc/init.d/fastd restart
-    echo Set Segment: $SEGNUM, MTU: $NEWMTU
+  /sbin/ifdown client
+  /etc/init.d/fastd restart
+  /sbin/ifup client
+  echo Set Segment: $SEGNUM
 else
-    echo No changes
+  echo No changes
 fi