DDNS with v6 & v4

[Tim Dean]

I've found that, at the moment, a workaround method to handle this DDNS update issue between v4 and v6 clients is to segregate the zones.  (Example:  Insert v4 clients into "vulture.test" and v6 clients into a new zone called "ipv6.vulture.test".)

AFAIK this is a known issue with the current DDNS implementation in ISC DHCP 4.2.0-P2.  (Not sure which version is built into RHEL6.)



From: Jarrod Johnson
Sent: Thursday, January 27, 2011 12:22 PM
To: Users of ISC DHCP
Subject: DDNS with v6 & v4

So I have dhcpd running for IPv4 and another for IPv6.  When a client performs the first DHCP (in this example, IPv6) and triggers the dhcp server to do the ddns up, all is well:
Jan 27 10:48:54 cirrus named[5315]: client 192.168.127.253#54564: signer "xcat_key" approved
Jan 27 10:48:54 cirrus named[5315]: client 192.168.127.253#54564: updating zone 'vulture.test/IN': adding an RR at 'h04.vulture.test' AAAA
Jan 27 10:48:54 cirrus named[5315]: client 192.168.127.253#54564: updating zone 'vulture.test/IN': adding an RR at 'h04.vulture.test' TXT
Jan 27 10:48:54 cirrus dhcpd: Added new forward map from h04.vulture.test to fd2d:c747:f314:d001:7843:4154:ef39:de38


However when the client subsequently does the IPv4 address, it refuses to do the A record:

Jan 27 10:49:45 cirrus named[5315]: client 192.168.127.253#43968: updating zone 'vulture.test/IN': update unsuccessful: h04.vulture.test: 'name not in use' prerequisite not satisfied (YXDOMAIN)
Jan 27 10:49:45 cirrus named[5315]: client 192.168.127.253#47226: updating zone 'vulture.test/IN': update unsuccessful: h04.vulture.test/TXT: 'RRset exists (value dependent)' prerequisite not satisfied (NXRRSET)
Jan 27 10:49:45 cirrus dhcpd: Forward map from h04.vulture.test to 192.168.72.4 FAILED: Has an address record but no DHCID, not mine.


If I scrub everything clean, everything will be fine for the A record, but I cannot seem to make the DHCP servers handle both the A and the AAAA record at the same time.  Is there a way to take care of this?  This is the dhcpd variant as shipped by Red Hat in RHEL6.
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