Trying to configure ipv4 and ipv6 addresses on hosts using one dhcp server fails.

Eddie Lania eddie at
Tue Aug 24 18:25:12 UTC 2010

Maybe someone can help me with this?

I am using dhcp server with ddns updates interim enabled.

I have been using this for a number of years for configuring ipv4
addresses on hosts on the LAN without any problems.

Now, when running dhcp for both dhcpv4 and v6 clients on the same
server, dhcp service does not allow for an exsisting v4 record to be
updated with v6:

Aug 23 13:41:58 ls2ka named[13070]: client updating
zone '': update unsuccessful: 'name not in use' prerequisite not satisfied
Aug 23 13:41:58 ls2ka named[13070]: client updating
zone '': update unsuccessful: 'RRset exists (value dependent)'
prerequisite not satisfied (NXRRSET)
Aug 23 13:41:58 ls2ka dhcpd: Forward map from
to fdf5:a3af:1d9a::1f4 FAILED: Has an address record but no DHCID, not

This indicates that the client has performed a dns update through dhcp
when it queried for a v4 address, which has added a "TXT" record and
written an entry to the dhcp.leases file with a dhcid for the client.

I was hoping that I would be able to let the clients do also perform a
dhcp v6 request on the same server in order to provide them with a ipv6

Now I have been reading through the dhcp man pages and googeling on the
internet to find an answer but have not found the solution yet.

I assume this is being caused by the fact that i am not using the
"ignore-client-updates;" option in dhcpd.conf? And that that is why a
"TXT" record is being added for every dhcpv4 client that is not updating
the dns records itself but performs the ddns update through dhcp?

And if I am supposed to add the "ignore-client-updates;" option to the
dhcpd.conf, will I have to manually remove the "TXT" records for those
clients from the zone file? And also remove those client's entries from
the dhcpd.leases file as well?

Please help me.



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