Ubuntu
isc-dhcp package

  1. Bug #1533631
  2. Comment #11

Comment 11 for bug 1533631

Revision history for this message
VF (fviktor) wrote :

This problem has been happening to me recently with up to date Ubuntu 16.04 amd64 desktop.

Workaround is to clean up the broken state by removing all leases:

1. Disconnect from the network in Network Manager
2. Execute: sudo rm /var/lib/NetworkManager/dhclient*.lease
3. Connect to the network in Network Manager

After this dhclient -6 keeps running and IPv6 leases are renewed correctly.

I had this problem on a second very similar installation. There it has been verified that dhclient -6 process is killed/crashed right after acquiring the IPv6 address, so I had a second reproduction.

I saved the contents of /var/lib/NetworkManager and can send it to the developer fixing it on request. There must be something there crashing dhclient in IPv6 mode.