ipv6 static address lost after ifconfig down/up ipv4 stays

[Arjan]

Binary package hint: netscript-2.4

Hello,

using static configured ipv4 and ipv6 in /etc/networking/interfaces with ubuntu 10.04LTS 64 bits

like:
iface bck-int--eth1 inet static
 address 119.72.176.36
 netmask 255.255.255.240
 ip-proxy-arp 0
 ip-rp-filter 0

iface bck-int--eth1 inet6 static
 address 2C00:1388:FFFF::3
 netmask 124
 ip-proxy-arp 0
 ip-rp-filter 0

which works fine after a reboot, but when executing a manual "ifconfig bck-int--eth1 down" and up afterwards the ipv6 address gets lost.

hereby the output of a scenario, where you can see the steps. and what goes wrong. In the end i need a "ifconfig down" (again) folowed with ifup "bck-int--eth1" to get my ipv6 address back

root@ubuntu1004lts:/etc/network# ip addr show bck-int--eth1
5: bck-int--eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:24:81:e4:ab:42 brd ff:ff:ff:ff:ff:ff
    inet 119.72.176.36/28 brd 119.72.176.47 scope global bck-int--eth1
    inet6 2c00:1388:ffff::3/124 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::224:81ff:fee4:ab42/64 scope link
       valid_lft forever preferred_lft forever

root@ubuntu1004lts:/etc/network# ifconfig bck-int--eth1 down

root@ubuntu1004lts:/etc/network# ip addr show bck-int--eth1
5: bck-int--eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
    link/ether 00:24:81:e4:ab:42 brd ff:ff:ff:ff:ff:ff
    inet 119.72.176.36/28 brd 119.72.176.47 scope global bck-int--eth1

root@ubuntu1004lts:/etc/network# ifconfig bck-int--eth1 up

root@ubuntu1004lts:/etc/network# ip addr show bck-int--eth1
5: bck-int--eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:24:81:e4:ab:42 brd ff:ff:ff:ff:ff:ff
    inet 119.72.176.36/28 brd 119.72.176.47 scope global bck-int--eth1
    inet6 fe80::224:81ff:fee4:ab42/64 scope link
       valid_lft forever preferred_lft forever
root@ubuntu1004lts:/etc/network#

root@ubuntu1004lts:/etc/network# ifup bck-int--eth1
ifup: interface bck-int--eth1 already configured

root@ubuntu1004lts:/etc/network# ip addr show bck-int--eth1
5: bck-int--eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:24:81:e4:ab:42 brd ff:ff:ff:ff:ff:ff
    inet 119.72.176.36/28 brd 119.72.176.47 scope global bck-int--eth1
    inet6 fe80::224:81ff:fee4:ab42/64 scope link
       valid_lft forever preferred_lft forever
root@ubuntu1004lts:/etc/network# ifdown bck-int--eth1

root@ubuntu1004lts:/etc/network# ip addr show bck-int--eth1
5: bck-int--eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
    link/ether 00:24:81:e4:ab:42 brd ff:ff:ff:ff:ff:ff
    inet 119.72.176.36/28 brd 119.72.176.47 scope global bck-int--eth1

root@ubuntu1004lts:/etc/network# ifup bck-int--eth1
Restarting openntpd:
ntpd.
ssh stop/waiting
ssh start/running, process 11029
Restarting openntpd: ntpd.
ssh stop/waiting
ssh start/running, process 11135
root@ubuntu1004lts:/etc/network#

root@ubuntu1004lts:/etc/network# ip addr show bck-int--eth1
5: bck-int--eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:24:81:e4:ab:42 brd ff:ff:ff:ff:ff:ff
    inet 119.72.176.36/28 brd 119.72.176.47 scope global bck-int--eth1
    inet6 2c00:1388:ffff::3/124 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::224:81ff:fee4:ab42/64 scope link
       valid_lft forever preferred_lft forever
root@ubuntu1004lts:/etc/network#

[Matt Grant (mattgrant)]

You are still running ifup/ifdown. For Lucid and later you need netscript-2.4-upstart version 5.2.4 or later. This to avoid problems with upstart... This is available over at http://packages.debian.org/sid/netscript-2.4-upstart. Also set up bash as /bin/sh. I am looking at changing to #!/bin/bash in /sbin/netscript next version - dash does not list shell functions that results in the exec functionality not working.

[Thomas Dreibholz (dreibh)]

The problem may be related to bug #1218442 (https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1218442), which occurs with the ifupdown package included in Ubuntu.