| 2012-06-15 10:22:52 |
Juha Aatrokoski |
bug |
|
|
added bug |
| 2012-06-15 10:33:00 |
Juha Aatrokoski |
description |
The default route cannot be provided via DHCPv6, it must be obtained from router advertisements. However, when using the dhcp method for inet6 in /etc/network/interfaces (e.g. "iface eth0 inet6 dhcp"), ifup will set net.ipv6.conf.<IFACE>.accept_ra=0, resulting in no default route for IPv6. Instead, it should explicitly set accept_ra=1.
A workaround is to set it in a post-up script. However, Linux apparently only sends router solicitations when the interface is brought up, so if unsolicited RA:s are infrequent the host will be without a default route until the next RA. This can be worked around by "blinking" the interface down-up.
Another problem is that when bringing the interface down on dual-stack hosts, there will be a long timeout. This is because bringing down IPv4 also brings the interface link down, and afterwards dhclient cannot release the DHCPv6 lease due to the link being down ("RTNETLINK answers: Cannot assign requested address"). The workaround is to bring the link back up before bringing IPv6 down.
So the workarounds (which obviously should not be needed) for a dual-stack dhcp client look like this:
iface eth0 inet dhcp
iface eth0 inet6 dhcp
up sysctl net.ipv6.conf.$IFACE.accept_ra=1
up ip link set dev $IFACE down
up ip link set dev $IFACE up
pre-down ip link set dev $IFACE up |
The default route cannot be provided via DHCPv6, it must be obtained from router advertisements. However, when using the dhcp method for inet6 in /etc/network/interfaces (e.g. "iface eth0 inet6 dhcp"), ifup will set net.ipv6.conf.<IFACE>.accept_ra=0, resulting in no default route for IPv6. Instead, it should explicitly set accept_ra=1.
A workaround is to set it in a post-up script. However, Linux apparently only sends router solicitations when the interface is brought up, so if unsolicited RA:s are infrequent the host will be without a default route until the next RA.
Another problem is that when bringing the interface down on dual-stack hosts, there will be a long timeout. This is because bringing down IPv4 also brings the interface link down, and afterwards dhclient cannot release the DHCPv6 lease due to the link being down ("RTNETLINK answers: Cannot assign requested address"). The workaround is to bring the link back up before bringing IPv6 down.
So the workarounds (which obviously should not be needed) for a dual-stack dhcp client look like this:
iface eth0 inet dhcp
iface eth0 inet6 dhcp
up sysctl net.ipv6.conf.$IFACE.accept_ra=1
pre-down ip link set dev $IFACE up |
|
| 2012-06-28 18:30:43 |
Stéphane Graber |
ifupdown (Ubuntu): status |
New |
Fix Committed |
|
| 2012-06-28 18:30:48 |
Stéphane Graber |
ifupdown (Ubuntu): importance |
Undecided |
Medium |
|
| 2012-06-28 20:14:35 |
Stéphane Graber |
ifupdown (Ubuntu): assignee |
|
Stéphane Graber (stgraber) |
|
| 2012-07-03 16:19:11 |
Launchpad Janitor |
ifupdown (Ubuntu): status |
Fix Committed |
Fix Released |
|
| 2012-09-21 19:57:53 |
Thomas |
bug |
|
|
added subscriber Thomas C. |
| 2012-10-23 07:50:24 |
Stéphane Graber |
nominated for series |
|
Ubuntu Precise |
|
| 2012-10-23 07:50:24 |
Stéphane Graber |
bug task added |
|
ifupdown (Ubuntu Precise) |
|
| 2012-10-23 07:50:36 |
Stéphane Graber |
ifupdown (Ubuntu Precise): status |
New |
Triaged |
|
| 2012-10-23 07:50:39 |
Stéphane Graber |
ifupdown (Ubuntu Precise): importance |
Undecided |
Low |
|
| 2012-10-23 07:50:43 |
Stéphane Graber |
ifupdown (Ubuntu Precise): assignee |
|
Stéphane Graber (stgraber) |
|
| 2012-10-23 19:37:43 |
David Burns |
bug |
|
|
added subscriber David Burns |
| 2012-12-11 21:04:32 |
Launchpad Janitor |
branch linked |
|
lp:ubuntu/ifupdown |
|
| 2013-08-18 08:40:11 |
Juri Haberland |
bug |
|
|
added subscriber Juri Haberland |
| 2013-09-02 20:41:17 |
Peter Silva |
bug |
|
|
added subscriber Peter Silva |
| 2014-01-24 22:19:54 |
Thiago Martins |
bug |
|
|
added subscriber Thiago Martins |
| 2014-01-27 12:06:28 |
Nikolay Bryskin |
bug |
|
|
added subscriber Nikolay Bryskin |
| 2015-08-27 11:38:06 |
Kees B |
bug |
|
|
added subscriber Kees B |
| 2015-10-05 15:43:05 |
Corin Langosch |
bug |
|
|
added subscriber Corin Langosch |
| 2015-11-09 19:42:39 |
Stéphane Graber |
ifupdown (Ubuntu Precise): assignee |
Stéphane Graber (stgraber) |
|
|
| 2015-11-09 19:42:41 |
Stéphane Graber |
ifupdown (Ubuntu): assignee |
Stéphane Graber (stgraber) |
|
|
| 2016-09-24 11:28:59 |
Dan Streetman |
bug |
|
|
added subscriber Dan Streetman |
| 2016-09-24 11:44:54 |
Dan Streetman |
ifupdown (Ubuntu): assignee |
|
Dan Streetman (ddstreet) |
|
| 2016-09-24 11:44:56 |
Dan Streetman |
ifupdown (Ubuntu Precise): assignee |
|
Dan Streetman (ddstreet) |
|
| 2019-04-04 12:24:54 |
Dan Streetman |
ifupdown (Ubuntu): assignee |
Dan Streetman (ddstreet) |
|
|
| 2019-04-04 12:24:56 |
Dan Streetman |
ifupdown (Ubuntu Precise): assignee |
Dan Streetman (ddstreet) |
|
|
| 2019-05-25 14:30:00 |
Dan Streetman |
ifupdown (Ubuntu Precise): status |
Triaged |
Won't Fix |
|
| 2019-05-25 14:30:08 |
Dan Streetman |
removed subscriber Dan Streetman |
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