full socket buffers

[sthaug at nethelp.no]

> A little background on the OS tunables, which may help the OP get his
> problem straightened out.
> 
> Or not.  Frankly, the "it starts to fail after a few days" business makes it
> sound like it's not directly a buffer problem, but rather a buffer servicing
> problem.

I believe this may be a correct analysis. We had some problems when
we started using ISC DHCP in a failover configuration. These problems
made us believe that dhcpd can get into a situation where there is
starvation of the TCP redundancy traffic due to a high rate of UDP
traffic and/or disk I/O. See

https://lists.isc.org/pipermail/dhcp-users/2009-November/010405.html

and the links in that message.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no