DHCPDISCOVER packets being received by host, but not responded to by dhcpd

[Kyle Dion]

FYI, we saw with strace that the process *was* receiving the packets, 
despite no log entries or replies.  In the end, all it took to resolve 
the problem was restarting the service.  Why dhcpd was dropping the 
packets, we may never know.

Thanks,
  -Kyle

Kyle Dion wrote:
> Hi all,
> This is kind of an off the wall question, and I'm not sure if this is 
> the right place to ask it.  If this is not the right forum, then I 
> apologize in advance.  I am running a pair of ISC DHCP 4.0.1 servers, 
> with failover, on RHEL4 (32-bit).  Generally, this setup works 
> flawlessly.  However, I have run into a situation recently, where a 
> small number of clients are sending DHCPDISCOVER packets to the servers, 
> and I have been able to confirm with packet captures on the server, that 
> the host is receiving them.  However, the logs never show that dhcpd 
> received or recognized the DHCPDISCOVERs.  Also, maybe not surprisingly, 
> the server-side packet captures show that the server never responds with 
> a DHCPOFFER (or any other message).  The DHCPDISCOVER packets AFAICT 
> with Wireshark *are* valid, so I am at a loss.  Any light that could be 
> shed on this or any guidance as to further troubleshooting steps or a 
> better place to escalate this would be greatly appreciated.
> 
> Thanks,
>