** Patch added: "lp1609898-nm-xenial.debdiff" https://bugs.launchpad.net/ubuntu/precise/+source/network-manager/+bug/1609898/+attachment/4741542/+files/lp1609898-nm-xenial.debdiff
-- 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/1609898 Title: dhclient incorrectly assumes a /64 ipv6 prefix Status in isc-dhcp package in Ubuntu: Fix Committed Status in network-manager package in Ubuntu: New Status in isc-dhcp source package in Precise: Fix Committed Status in network-manager source package in Precise: Invalid Status in isc-dhcp source package in Trusty: Fix Committed Status in network-manager source package in Trusty: New Status in isc-dhcp source package in Xenial: Fix Committed Status in network-manager source package in Xenial: New Status in isc-dhcp source package in Yakkety: Fix Committed Status in network-manager source package in Yakkety: New Status in isc-dhcp package in Debian: Fix Released Bug description: [Impact] clients who get an ipv6 address from a dhcpv6 server assume the address has a /64 prefix, but that is not necessarily true, and if the subnet is different than /64 those clients will not be able to reach other addresses in that /64 prefix because the other systems are not on-link. This /64 assumption of dhclient effectively breaks the client networking for certain addresses. [Test Case] Set up a server with two interface nics, and one client connected to each of those interfaces. On the server, set up a ipv6 subnet on each interface, with a larger prefix than /64, e.g.: 2001:db8:0:0:1::/96 2001:db8:0:0:2::/96 configure dhcpv6 on the server, to provide ipv6 addresses on each interface. Set the server as the default ipv6 route for the clients. Allow the clients to get dhcpv6 ipv6 addresses from the server. The clients will each get a ipv6 address with a /64 prefix, due to the bug in dhclient. Try to ping (or otherwise communicate) between the clients. Since they have /64 prefixes, they think they are on-link with each other, but they are not, so they can't communicate. After the dhclient bug is fixed, repeat the above setup, and the clients will get /128 prefixes instead, and then will be able to communicate with each other, because they will route the traffic to each other through the server. [Regression potential] None. Non-standard (i.e. not /64) subnets served by dhcpv6 currently are broken, this fixes that. [Other info] This is fixed in debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684009 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1609898/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
