Yes, seeing this too on 15.10 since around the first week of March, as best I can tell, but irrespective of Suspend.
It looks like dhclient thinks/is told the new lease is 'depreferred' and therefore quits, and the dhclient process is terminated, but the address remains on the interface until the valid-lifetime expires. Mar 22 16:06:02 hephaestion NetworkManager[1468]: <info> Activation (wlp3s0) Beginning DHCPv6 transaction (timeout in 45 seconds) Mar 22 16:06:02 hephaestion NetworkManager[1468]: <info> dhclient started with pid 19221 Mar 22 16:06:03 hephaestion dhclient: XMT: Confirm on wlp3s0, interval 950ms. Mar 22 16:06:03 hephaestion dhclient: RCV: Reply message on wlp3s0 from fe80::ee43:f6ff:fe46:c080. Mar 22 16:06:03 hephaestion dhclient: message status code Success. Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> valid_lft 86400 Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> preferred_lft 86400 Mar 22 16:06:03 hephaestion dhclient: PRC: Rebinding lease on wlp3s0. Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> address 2a02:8011:2007::2 Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> nameserver '2a02:8010:1:0:212:23:3:100' Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> (wlp3s0): DHCPv6 state changed unknown -> bound Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> Policy set 'wireless.lan.iam.tj' (wlp3s0) as default for IPv6 routing and DNS. Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> Writing DNS information to /sbin/resolvconf Mar 22 16:06:03 hephaestion dnsmasq[2433]: setting upstream servers from DBus Mar 22 16:06:03 hephaestion dnsmasq[2433]: using nameserver 2a02:8010:1:0:212:23:3:100#53 Mar 22 16:06:03 hephaestion dnsmasq[2433]: using nameserver 10.254.1.254#53 Mar 22 16:06:03 hephaestion nm-dispatcher: Dispatching action 'dhcp6-change' for wlp3s0 Mar 22 16:06:03 hephaestion dhclient: PRC: Address 2a02:8011:2007::2 depreferred. Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> (wlp3s0): DHCPv6 state changed bound -> unknown Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> (wlp3s0): DHCPv6 state changed unknown -> expire Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> (wlp3s0): canceled DHCP transaction, DHCP client pid 19221 Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info> (wlp3s0): DHCPv6 state changed expire -> done $ ip -6 addr show dev wlp3s0 3: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000 inet6 2a02:8011:2007::2/128 scope global dynamic valid_lft 82942sec preferred_lft 82942sec inet6 fe80::21f:3bff:febd:7485/64 scope link valid_lft forever preferred_lft forever -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1533631 Title: Failed to renew DHCPv6 lease after suspend Status in network-manager package in Ubuntu: Confirmed Bug description: After fixing IPv6 address assignment (#1469346), IPv6 works fine until sleep. On wake up ubuntu fails to renew its IPv6 lease: Jan 13 10:47:47 ubuntu dhclient: PRC: Renewing lease on wlp3s0. Jan 13 10:47:47 ubuntu dhclient: PRC: Rebinding lease on wlp3s0. Jan 13 10:47:47 ubuntu dhclient: XMT: Rebind on wlp3s0, interval 9890ms. Jan 13 10:47:47 ubuntu NetworkManager[796]: <info> (wlp3s0): DHCPv6 state changed bound -> unknown Jan 13 10:47:47 ubuntu dhclient: PRC: Address 2a02:xxxx:xxxx:xxxx::b44 depreferred. Jan 13 10:47:47 ubuntu NetworkManager[796]: <info> (wlp3s0): DHCPv6 state changed unknown -> expire Jan 13 10:47:47 ubuntu NetworkManager[796]: <info> (wlp3s0): canceled DHCP transaction, DHCP client pid 1170 Jan 13 10:47:47 ubuntu NetworkManager[796]: <info> (wlp3s0): DHCPv6 state changed expire -> done I'm not sure that it's solely NetworkManager issue (dhclient could also be affected). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1533631/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp