I'm running Debian-Stretch 9.4 and I'm observing a similar problem that after some time my servers disappears from the network; usually first the IPv6 address, the usually some time later the IPv4 address, but not always.
All computers are connected to my FritzBox 7420: - for IPv4 I'm using the fixed address 192.168.xxx.33/24, which the FritzBox always assigns only to that host. - for IPv6 I get a daily changing IPv6 address from my internet provider each night, which gets propagated by RA. The affected host is using systemd 232-25+deb9u2 and I have configured systemd-networkd to do the network configuration: /etc/systemd/network/40-dhcp.network DHCP=ipv4 IPv6AcceptRA=yes For now I have disabled DHCP for ipv4 and switched to a static configuration, as it sometimes happens that the network is flacky and does not receive an address during boot at all. I once compiled my own version of systems with this patch included: <https://github.com/systemd/systemd/pull/6918/commits/7f676aa324cb5498a5f9caaaa3d51ecfe53242e0> It is for <https://github.com/systemd/systemd/issues/5625>. While I had that custom version running I did *not* observe those issues, but then Debian shipped a security update and since than the problem is back. This might not be the same issue as there have been different comments in this issue mentioning ifupdown, NetworkManager, ..., but perhaps affected users should clarify their environment, e.g. IPv4 and/or IPv6, static addresses or changing addresses/prefixes, ... ** Bug watch added: github.com/systemd/systemd/issues #5625 https://github.com/systemd/systemd/issues/5625 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1586528 Title: Avahi-daemon withdraws address record Status in avahi package in Ubuntu: Confirmed Status in network-manager package in Ubuntu: Confirmed Bug description: For some reason, if I leave my Ubuntu VM up for a prolonged period of time the machine will lose connection to the network. ip addr shows that the nic port no longer has an address and an examination of the syslog shows this: May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Withdrawing address record for 10.0.2.15 on enp0s3. May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Leaving mDNS multicast group on interface enp0s3.IPv4 with address 10.0.2.15. May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Interface enp0s3.IPv4 no longer relevant for mDNS. for no known reason. The only reliable way to get the network to come back (that I have found) is a full reboot. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: avahi-daemon 0.6.32~rc+dfsg-1ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Fri May 27 15:11:34 2016 InstallationDate: Installed on 2015-10-22 (218 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) SourcePackage: avahi UpgradeStatus: Upgraded to xenial on 2016-03-30 (58 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1586528/+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
