exceedingly long time in assigning ip addresses
dhcp1 at thehobsons.co.uk
Mon Dec 13 18:46:54 UTC 2010
Chris Buxton wrote:
>Since both DHCP servers are on the same LAN, could it be that the
>other server has "authoritative" set? If so, is it possible to set
>that server as "not authoritative"?
>The difference is whether the other server sends NAK responses to
>requests. It could be that for the clients in question, the other
>server's NAK is beating your server's ACK.
Turning off authoritative isn't a good idea if you can avoid it - it
creates problems of it's own, such as clients moving between networks
and not getting configured properly.
I have come across that before, it was a Windows XP client at
customers site. We had arranged with the network guys to pipe their
internal network across the campus so the receptionist in another
building could be on their internal network - but when we plugged it
in, it didn't work.
After much scratching of heads, and puzzlement as to why my Mac
worked, I figured that their DHCP server wasn't authoritative and
wasn't NACKing the clients requests for an invalid address. I think I
picked an address, checked it wasn't in use, and configured the PC to
use it - and then set it back to DHCP. The client then requested the
address I'd picked and the server ACK'd it.
Better to configure both servers with the correct shared network -
the ISC server will simply ignore requests for an address which is
valid for the subnet but not available for lease.
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