--- debian-add_ip.sh.0  2009-03-05 18:57:40.000000000 +0100
+++ debian-add_ip.sh    2009-03-05 19:02:43.000000000 +0100
@@ -87,8 +87,8 @@
            printf "
 auto ${VENET_DEV}:${ifnum}
 iface ${VENET_DEV}:${ifnum} inet6 manual
-       up   ifconfig ${VENET_DEV}:${ifnum} add ${ip}
-       down ifconfig ${VENET_DEV}:${ifnum} del ${ip}
+       up   ifconfig ${VENET_DEV}:${ifnum} add ${ip}/0
+       down ifconfig ${VENET_DEV}:${ifnum} del ${ip}/0
 " >> ${CFGFILE}.bak
        fi