DHCP failover and fixed-address
Phil Mayers
p.mayers at imperial.ac.uk
Mon Mar 3 10:16:52 UTC 2008
Sebastian Hagedorn wrote:
> Hi,
>
> we're currently using ISC dhcpd 3.0.3 in a failover setup. From previous
> discussions I think I know (but am uncertain) that 3.0.3 does not
> support host statements with fixed-address in failover mode. However, it
As you've seen, it doesn't need to. Because fixed-addresses are, well,
fixed, an arbitrarily large number of DHCP servers can OFFER/ACK them
and the client will take the first one it gets (time-wise).
> seems to work (somewhat). We have many lines like this:
>
> host ap1200-ustb-ort-1 {hardware ethernet
> 00:0c:30:60:09:09;fixed-address 172.20.15.2;}
>
> They are in both our server's configs. Both servers are configured as
> helper-addresses on our Cisco routers. Both servers get and serve the
> requests. I don't think there's any harm in that, but I wanted to make
> sure ...
We've been doing that for years without failover enabled and it works fine.
>
> Also, ISTR that some newer version of dhcpd properly supports such
> scenarios, but I haven't been able to find anything in the release
> notes. Am I confused?
I'm not sure how it could support them any better, but I guess there
might be optimisations.
>
> Thanks, Sebastian
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