Was able to reproduce, my workaround was a systemd timer to clear the dhcp lease files and restart networkmanager... which is rather violent.
Confirmed client side problem, Win7,Win10,MacOS Montemery and Android 11 have no problems and do not lose their ipv6 on the same network. -- 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/1969901 Title: network-manager fails to renew ipv6 address Status in network-manager package in Ubuntu: Confirmed Bug description: [Impact] * This affects Ubuntu 18.04 where Network Manager version 1.10.6 is used. * Network manager might kill dhclient(6) and fail to start it again causing the IPv6 address to be lost on a network that uses mixed IPv4/IPV6. The network status will still be seen as online in gnome since ipv4 is still active. The user then have to manually remove the dhcpv6 lease files and restart ipv6 connection/restart network manager to regain IPv6 connectivity. * This is a cherry-pick from Network manager 1.10.8 (Ubuntu's version is based on 1.10.6): https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/7fbbe7ebee99785e38d39c37e515a64a28edef0f * Upstream bug: https://bugzilla.gnome.org/show_bug.cgi?id=783391 [Test Plan] * The exact conditions for reproducing this bug on mixed IPv4/IPv6 networks are not known but includes using both IPv4 and IPv6, both using dhcp. [Where problems could occur] * This patch could possibly break networking using and that would be bad. Network manager should be able to restart connection more properly with this patch though. [Other Info] * We have tested this patch on a couple of clients where we have seen this this problem. If this patch is feasible to include in Ubuntu 18.04 we could request more users to test. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1969901/+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
