After looking into this more (and working on Bug #1629972 some), there
are couple of issues with the new configure_networking:
1. since it checks only for the existence of /run/net-${DEVICE}.conf,
and the dhclient scripts ALWAYS (even on failure) create it, it will try
to get a lease exactly once before bailing out. Ideally, if both ipv4
and ipv6 are present on the vlan, then both would be configured and (as
is done) present in the net-$DEV.conf file.
2. Since router-advertisements are needed for the on-link indication
(and routes), ipv6 configuration via dhcp should wait until such time as
there is at least a (non-fe80) route for some ipv6 cidr on $DEVICE
(which RA should create). This will eliminate the iscsi-timeout errors
that we see when configure_networking() returns before RA configures
routing. Note that a default route is not necessary. Note also that it
should timeout on the RA if it doesn't show up in a reasonable time,
complain that it got no RA, and then _not_ bring up ipv6 on the
interface (RA is required, as per Bug #1609898)
** Tags removed: verification-pending
** Tags added: verification-failed
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu.
https://bugs.launchpad.net/bugs/1621507
Title:
initramfs-tools configure_networking() fails to dhcp ipv6 addresses
Status in MAAS:
Fix Released
Status in initramfs-tools package in Ubuntu:
Fix Released
Status in isc-dhcp package in Ubuntu:
Fix Released
Status in klibc package in Ubuntu:
Won't Fix
Status in open-iscsi package in Ubuntu:
Fix Released
Status in initramfs-tools source package in Xenial:
Fix Released
Status in isc-dhcp source package in Xenial:
Fix Released
Status in klibc source package in Xenial:
Won't Fix
Status in open-iscsi source package in Xenial:
Fix Released
Status in klibc package in Debian:
New
Bug description:
initramfs' configure_networking function uses ipconfig to configure the
network.
ipconfig does not support dhcpv6. See:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=627164
Related bugs:
* bug 1229458: grub2 needed changes
* bug 1621615: network not configured when ipv6 netbooted into cloud-init
[Impact]
It is not possible to netboot Ubuntu with a network-based root
filesystem in an ipv6-only environment. Anyone wanting to netboot in
an ipv6-only environment is affected.
These uploads address this by replacing the one-off klibc dhcp client
(IPv4-only) with the defacto standard isc-dhcp-client, and thereby
provide both ipv6 and ipv4 DHCP configuration.
[Test Case]
See Bug 1229458. Configure radvd, dhcpd, and tftpd for your ipv6-only
netbooting world. Pass the boot process an ipv6 address to talk to,
and see it fail to configure the network.
[Regression Potential]
1) This increases the uncompressed initramfs size by approximately 500KB,
since isc-dhcp-client is added, but klibc is still needed for some other
things, and is therefore present. On systems with a very small /boot
partition, this could result in failure to upgrade the initramfs.
2) In at least some cases, DHCP network configuration shifts from klibc's
ipconfig to isc-dhcp-client's dhclient. This should be of minimal risk, as
isc-dhcp-client is in very very widespread use. In the event of a regression,
network boot would fail, but the prior kernel should still be bootable.
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