Public bug reported:
/sbin/dhclient-script does not seem to pay any attention to the prefixlen that
is provided.
The result is that:
$ dhclient -6 -1 -v eth0
results in network configuration like this:
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
inet6 fd42:83bb:a360:8010:2527:abdf:95cb:5e55/128 scope global
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe12:3456/64 scope link
valid_lft forever preferred_lft forever
when it should have a /64 on the fd42 address, and subsequently no
ability to reach other hosts on that network.
The fix seems simple enough:
ip -6 addr add ${new_ip6_address}${new_ip6_prefixlen:+/${new_ip6_prefixlen}}
dev ${interface} scope global
Ie, we just have to add '/${new_ip6_prefixlen}' if it is set.
This link seems relevant:
https://kb.isc.org/article/AA-01141/0/How-to-workaround-IPv6-prefix-
length-issues-with-ISC-DHCP-clients.html
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: isc-dhcp-client 4.3.3-5ubuntu15
ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7
Uname: Linux 4.8.0-17-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
Date: Mon Oct 10 20:23:42 2016
DhclientLeases:
JournalErrors:
Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000']
failed with exit code 1: Hint: You are currently not seeing messages from other
users and the system.
Users in the 'systemd-journal' group can see all messages. Pass -q to
turn off this notice.
No journal files were opened due to insufficient permissions.
ProcEnviron:
TERM=screen-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: isc-dhcp
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug uec-images yakkety
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https://bugs.launchpad.net/bugs/1632096
Title:
dhclient-script does not respect ip6_prefixlen
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