Multiple DHCP Servers with DDNS Best Practice/Workaround?

Colin Simpson Colin.Simpson at
Thu May 12 13:45:11 UTC 2011

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. 

> Note that there are options you can set in the dhcp response to cause
> windows clients to release any leases on shutdown. Search the archives
> for full details. So if you have windows laptops (for example) this
> might be able to work.

Yeah they do, the problem is they just tend to whip the cable out of
their laptop and move to another part of the building or hop on


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