** Description changed:
[Impact]
isc-dhcp-client in precise does not do stateless DHCPv6 correctly if it's
enabled as "dhcp 1" within "iface <IFACE> inet6 auto" within
/etc/network/interfaces. The dhclient-script responsible for updating
/etc/resolv.conf exists if it doesn't find an IPv6 address in its environment,
which is only true for stateful DHCPv6.
[Test Case]
* You should have IPv6 on your network segment, make a note of the subnet.
* Have a stateless DHCPv6 server listen on the network segment:
** Minimal dhcpd6.conf:
authoritative;
option dhcp6.name-servers 2001:4860:4860::8888, 2001:4860:4860::8844;
option dhcp6.domain-search "ubuntu.com";
- subnet6 fd7a:4ac2:1751:0::/64 {};
+ pid-file-name "/tmp/dhcpd.test.pid";
+ subnet6 fd7a:4ac2:1751:0::/64 {}
** Adjust the subnet information to the one you're actually using or the DHCP
server will refuse to start.
** Install isc-dhcp-server on a host on the same network segment.
+ ** Disable apparmor (it will yield losts of EPERM for the test file
locations).
** Start up the server there using: /usr/sbin/dhcpd -cf dhcpd.conf -6 -lf
/tmp/leases.test
* Have network configuration be managed by ifupdown, not network-manager:
* Add the following configuration to /etc/network/interfaces:
iface eth0 inet6 auto
- dhcp 1
- * ifdown eth0
- * ifup eth0
+ dhcp 1
+ * ifdown eth0 && ifup eth0 (alternatively: dhclient -6 -S -v IFACE)
* Check if /etc/resolv.conf contains:
- search ubuntu.com
+ search ubuntu.com.
nameserver 2001:4860:4860::8888
nameserver 2001:4860:4860::8844
[Regression Potential]
The suggested change is already present since quantal. The change itself is
self-contained
[Additional Info]
/sbin/dhclient-script in precise's isc-dhcp-client 4.1.ESV-R4-0ubuntu5.8
contains the following snippet:
BOUND6|RENEW6|REBIND6)
if [ -z "${new_ip6_address}" ] || [ -z "${new_ip6_prefixlen}" ]; then
exit_with_hooks 2
fi
# set leased IP
ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${interface} scope global
This assumes that the result of the DHCPv6 transaction is an address
with a prefix, which is the case for stateful DHCPv6. For stateless
DHCPv6, however, we only get additional information that's not directly
address-related. This is fixed since quantal and reads like this:
BOUND6|RENEW6|REBIND6)
if [ "${new_ip6_address}" ] && [ "${new_ip6_prefixlen}" ]; then
# set leased IP
ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${interface} scope global
fi
It looks like the only change from the diff to the current saucy version
we need for it to work correctly.
** Description changed:
[Impact]
isc-dhcp-client in precise does not do stateless DHCPv6 correctly if it's
enabled as "dhcp 1" within "iface <IFACE> inet6 auto" within
/etc/network/interfaces. The dhclient-script responsible for updating
/etc/resolv.conf exists if it doesn't find an IPv6 address in its environment,
which is only true for stateful DHCPv6.
[Test Case]
* You should have IPv6 on your network segment, make a note of the subnet.
* Have a stateless DHCPv6 server listen on the network segment:
** Minimal dhcpd6.conf:
authoritative;
option dhcp6.name-servers 2001:4860:4860::8888, 2001:4860:4860::8844;
option dhcp6.domain-search "ubuntu.com";
pid-file-name "/tmp/dhcpd.test.pid";
subnet6 fd7a:4ac2:1751:0::/64 {}
** Adjust the subnet information to the one you're actually using or the DHCP
server will refuse to start.
** Install isc-dhcp-server on a host on the same network segment.
** Disable apparmor (it will yield losts of EPERM for the test file
locations).
** Start up the server there using: /usr/sbin/dhcpd -cf dhcpd.conf -6 -lf
/tmp/leases.test
* Have network configuration be managed by ifupdown, not network-manager:
* Add the following configuration to /etc/network/interfaces:
iface eth0 inet6 auto
dhcp 1
* ifdown eth0 && ifup eth0 (alternatively: dhclient -6 -S -v IFACE)
* Check if /etc/resolv.conf contains:
search ubuntu.com.
nameserver 2001:4860:4860::8888
nameserver 2001:4860:4860::8844
+ * If the old version of the package is installed, /etc/resolv.conf content
will not change.
[Regression Potential]
The suggested change is already present since quantal. The change itself is
self-contained
[Additional Info]
/sbin/dhclient-script in precise's isc-dhcp-client 4.1.ESV-R4-0ubuntu5.8
contains the following snippet:
BOUND6|RENEW6|REBIND6)
if [ -z "${new_ip6_address}" ] || [ -z "${new_ip6_prefixlen}" ]; then
exit_with_hooks 2
fi
# set leased IP
ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${interface} scope global
This assumes that the result of the DHCPv6 transaction is an address
with a prefix, which is the case for stateful DHCPv6. For stateless
DHCPv6, however, we only get additional information that's not directly
address-related. This is fixed since quantal and reads like this:
BOUND6|RENEW6|REBIND6)
if [ "${new_ip6_address}" ] && [ "${new_ip6_prefixlen}" ]; then
# set leased IP
ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${interface} scope global
fi
It looks like the only change from the diff to the current saucy version
we need for it to work correctly.
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https://bugs.launchpad.net/bugs/1214385
Title:
Stateless DHCPv6 not working in precise
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https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1214385/+subscriptions
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