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Message #25237
[Bug 1352255] Re: Impossible to configure network interface with only IPv6 address
I did a fair amount of debug information including recreation with a
cloud image at lp:~smoser/+junk/lp-1377005 . I'll copy the final comment
here.
ok. so, i now know what happens, and why adding anything before the ipv6 address "fixes" the problem.
boot happens like this:
* system boot
* net-device-added fires network-interface.conf
* net-device-added runs ifup --allow auto
* ifup --allow auto reads /etc/network/interfaces *in order*
* after the *first* stanza is brought up, /etc/network/if-up.d/upstart is invoked
* /etc/network/if-up.d/upstart finds all interfaces to be up and emits static-network-up
* /etc/init/failsafe.conf is stopped, freeing procps.conf to start
* procps.conf runs sysctl on files in /etc/sysctl.d/*.conf
which includes /etc/sysctl.d/10-ipv6-privacy.conf
ipv6-privacy.conf ends up killing the existing addresses.
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https://bugs.launchpad.net/bugs/1352255
Title:
Impossible to configure network interface with only IPv6 address
Status in “ifupdown” package in Ubuntu:
Confirmed
Bug description:
As it says on the tin.
I'm unable to configure my Ubuntu 14.04 VM to have only an IPv6 address on boot-up.
Dual stack works fine.
My /etc/networking/interfaces looks like this:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet6 static
address 2001:610:188:444::55
netmask 64
gateway 2001:610:188:444::1
autoconf 0
privext 0
accept_ra 0
dns-search terena.org
dns-domain terena.org
dns-nameservers 2001:610:1:800a:192:87:106:106
After boot-up there is only a link-local address:
root@trusty-test:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:50:56:95:42:ab
inet6 addr: fe80::250:56ff:fe95:42ab/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:101 errors:0 dropped:0 overruns:0 frame:0
TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6644 (6.6 KB) TX bytes:2132 (2.1 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:240 errors:0 dropped:0 overruns:0 frame:0
TX packets:240 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:18192 (18.1 KB) TX bytes:18192 (18.1 KB)
However, if I manually ifdown/ifup the interface, then things start working:
root@trusty-test:~# ifdown eth0
root@trusty-test:~# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:240 errors:0 dropped:0 overruns:0 frame:0
TX packets:240 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:18192 (18.1 KB) TX bytes:18192 (18.1 KB)
root@trusty-test:~# ifup eth0
Waiting for DAD... Done
root@trusty-test:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:50:56:95:42:ab
inet6 addr: fe80::250:56ff:fe95:42ab/64 Scope:Link
inet6 addr: 2001:610:188:444::55/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:894 errors:0 dropped:0 overruns:0 frame:0
TX packets:652 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:168407 (168.4 KB) TX bytes:95052 (95.0 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:288 errors:0 dropped:0 overruns:0 frame:0
TX packets:288 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:21792 (21.7 KB) TX bytes:21792 (21.7 KB)
FYI, I have many 12.04 LTS VMs that work fine with the same configuration.
Many thanks!!!
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