Force DDNS updates?

Gregory Sloop gregs at
Mon Sep 14 19:17:55 UTC 2015

So, I'm not sure how this occurred, but I have dhcp clients/leases which exist, but which have no DDNS entry. [And normally, as DHCPD allocates IP addresses, it also updates/creates the DDNS entries for those hosts.]

But, now, until they get a new IP, they'll continue to not attempt to update their DDNS records [which don't exist] and so unless I somehow force the clients to new IP addresses they'll never get their DDNS records created/updated.

Now, how this happened, I'm not sure. 
And while it might be nice to know, the more pressing problem is how to fix it.

I know I can, for example, make the current IP of one of the problem stations "unavailable" and it will DHCP NAK the lease and when it gets a new IP, the DDNS entry gets updated/created. But that's an UGLY hack and *can't* be the best way, can it?

So, is there some way to force all DHCPD DDNS records to "update" even if they haven't changed?
Obviously this will place some [or lots, depending] of additional load on BIND, but that's a given.
[I'm quite sure my BIND server will handle the load, and if it doesn't - I'll take responsibility for burning down my house, all because I misused the gasoline and matches. :) ]

Now, perhaps I'm looking at it all wrong, and in my tunnel vision I can't find my way out of a wet paper bag - and if so, please correct me. But I do need some way, if possible, to force creation of the DDNS entries for these clients. 

"Help, I've fallen and I can't get up!" [I feel about that competent at the moment too!]

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