cannot renew IPV6 address

Simon Hobson dhcp1 at
Thu Jan 26 16:01:18 UTC 2017

Jean-Max Reymond <jmreymond at> wrote:

> After 12 hours, the interface is down and I cannot obtain a new IPV6 adress.

> $ /usr/local/sbin/dhclient -cf /etc/dhcp/dhclient6.conf -6 -P -v eno1

> ...
> RCV:  | | | X-- Max lifetime 43200.

OK, your lease is 12 hours, at the end of the lease you lose the address. Are you leaving the dhcp client running ? Is it sending any renewal requests ? Are you running a firewall that could be blocking DHCP6 ?

The basic troubleshooting at this point is to narrow it down to one of 3 things :

1) Your client isn't attempting to renew

2) Your client is attempting to renew but the server isn't responding

3) Something else - such as server responding but client doesn't accept it

You probably need to run a packet sniffer on the relevant interface and capture DHCP6 packets. That should answer the questions: Is the client trying to renew ? Is the server replying ?

More information about the dhcp-users mailing list