DHCPD server stops serving addresses since upgrade

[R.K.Hillman at bton.ac.uk]

Hi,

We have been using ISC DHCPD happily for some time now. We are running 
on a pair of Sun V240s and have just upgraded from 3.1.1 to 4.1.0.

We did attempt an upgrade to 4.0.0 a while ago but experienced problems 
and reverted back, suspecting that as 4.0.0 was new, there may have been 
some issues which would be sorted in a future release.

Unfortunately, with 4.1.0 we are still experiencing the same problem 
which is this. When a host requests an IP address based on its hardware 
ethernet and the client is on the same subnet as the servers, the server 
(and its secondary) stop serving. The DHCPd service is still up and 
running and is stoppable. There appears not to be any clue in the logs 
apart from, for example:

Mar 24 14:29:46 zaniah dhcpd: [ID 702911 local7.info] DHCPDISCOVER from 
00:14:51:02:2e:6c via bge0
Mar 24 14:29:46 zaniah dhcpd: [ID 702911 local7.info] DHCPOFFER on 
194.83.112.102 to 00:14:51:02:2e:6c via bge0

Then all the logs cease and noone else gets an address until we restart 
the servers

I've tried this with three different workstations and the result is 
always the same. We are serving IP addresses based on MAC addresses to 
computers on other subnets without any problems.

If anyone has any ideas about this I'd be grateful to hear.

Regards

Ray Hillman