DHCP and Dynamic DNS

[Chris Cox]

On Thu, 2008-05-08 at 11:20 +0100, Simon Hobson wrote:
> Roger Lestru wrote:
> 
> >We are using dhcpd and bind from ISC.  Our network is spread 
> >geographically, and we have a number of dns and dhcp servers.  Our 
> >dhcp servers are dynamically updating our bind primary server, with 
> >dhcp client updates, and that is working fine for the most part. 
> >The issue that we have, is when a wan link goes down, or when a 
> >remote dhcp server cannot contact the primary dns server, then the 
> >dns update fails.
> >
> >I'm wondering if there is a way around this with dhcpd?  Is it 
> >possible to queue the dns update, or something similar?
> 
> No, there are no facilities to deal with this.
> 
> The only way I could think of doing it would be to make sure that the 
> primary for any zone is on the same network as the DHCP server(s) 
> that update it - that way at least the primary could get updated and 
> slaves would follow when the link was back up.
> 
> Failing that, for adding records related to a new lease, the server 
> will retry next time the client renews.

I was going to recommend a shorter lease time as a potential
"somewhat" fix.  Would that help?