Checkpoint: added start/finish v6only

client/scripts/linux

@@ -400,6 +400,14 @@ case "$reason" in
 
         ;;
 
+    V6ONLY)
+        if [ -n "$old_ip_address" ]; then
+            # flush leased IP
+            ${ip} -4 addr flush dev ${interface} label ${interface}
+        fi
+
+        ;;
+
     ### DHCPv6 Handlers
     # TODO handle prefix change: ?based on ${old_ip6_prefix} and ${new_ip6_prefix}?