Multiple DHCP Servers with DDNS Best Practice/Workaround?

Glenn Satchell glenn.satchell at
Thu May 12 15:20:40 UTC 2011

On 05/12/11 23:45, Colin Simpson wrote:
> On Thu, 2011-05-12 at 13:21 +0100, Glenn Satchell wrote:
>> A single dhcp server managing multiple subnets can detect this if you
>> use 'one-lease-per-client true'. If a client turns up on another
>> subnet
>> it will release any previous lease and subsequently remove any DNS
>> entries before handing out the new lease and doing a DNS update.
>> With separate dhcp servers it really needs some inter-server
>> communication to release the old lease and remove the DNS entries. The
>> ISC server doesn't have that facility.
> Not sure they'd need to communicate if you could arrange for some method
> of consistently generating the TXT entries across servers.

Yeah, but the other server still thinks it has a valid lease and DNS 
entry. As long as it doesn't try to also delete the new DNS entry it 
should be ok I guess.


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