alexm at ndtel.com
Mon Mar 22 18:43:59 UTC 2010
First of all, forgive the cross post... You will understand why in a
I am experiencing a problem with DDNS. We have access equipment that
is performing DHCP snooping, and adding circuit and client identifiers
for CALEA purposes to the DHCP conversations. Also, we make decisions
based on the circuit id to determine what pool the client belongs in.
A change from the manufacturer has caused the client IDs to change if
the client configuration is changed. This change causes a couple of
things to happen, and this is where my problem lies:
1. Client requests assigned IP address after provisioning has changed
2. DHCP server NAKs based on the changed client ID.
3. Client and server process DISCOVER, OFFER, REQUEST, and ACK
sequence. Client is given a new IP address.
4. DHCP server attempts to change the DDNS information to DNS server.
5. DDNS update fails, with these in the DNS server log file:
Mar 18 10:55:46.770 update: info: client 10.4.0.4#44378: updating
zone 'rg/IN': update failed: 'name not in use' prerequisite not
Mar 18 10:55:46.774 update: info: client 10.4.0.4#44379: updating
zone 'rg/IN': update failed: 'RRset exists (value dependent)'
prerequisite not satisfied (NXRRSET)
Question: how do I fix this problem? Can I somehow force the DHCP
server to ignore the client ID and process only on the MAC address and
Circuit ID? And, why does the DNS server not accept the change from
an authorized DHCP server? How is a situation like this supposed to
I am currently running BIND 9.2.4 and DHCP 3.0.3. I know these are
both very old versions (servers have been up for 1585 days and 1494
days respectively), and I plan on upgrading to current releases during
tomorrow's maintenance period, but before doing that I would like to
know if it will help...
TIA, and if anything else is needed, please let me know.... My
configs are available if needed, don't wanna create such a long post
if it's not needed.
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