dhcp-related problem in a DOCSIS cable network

[fadey]

Thanks a lot for your reply. 
I guess it is a "ping-check" option you are talking about. Please
correct me if I'm wrong.
I'll try to disable it and see if that helps.
Thanks a lot once again
Dima



> Let me guess.....is the ping ahead feature turned on the DHCP server?
> 
> Kind regards,
> 
> Frank 
> 
> -----Original Message-----
> From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf
> Of fadey
> Sent: Tuesday, October 02, 2007 3:48 AM
> To: dhcp-users at isc.org
> Subject: dhcp-related problem in a DOCSIS cable network
> 
> Hi, everyone.
> I have a dhcp-related problem in my cable network. When all cable modems
> are being reset at once and try to get an IP, things get stuck. I see
> DHCPDISCOVER message from cable modems and DHCPOFFER sent back to them.
> Now a cable modem should send DHCPREQUEST, but instead it hangs out
> there quiet and in a while repeats its DHCPDISCOVER message. A Cisco
> CMTS is a dhcp relay agent.
> When I reset cable modems one by one all goes smooth (DISCOVER, OFFER,
> REQUEST and ACK).
> And the most strange thing is that after I stop dhcpd for a couple of
> seconds and then start it again, 3-5 cable modems manage to receive IPs.
> So after a whole lot of restarts I finally have my network going again.
> 
> If anyone has experienced anything like that, please let me know.
> Perhaps it is the cisco_CMTS where I should be looking for a problem,
> and not dhcp.
> 
> Thanks in advance.
> 
> P.S. My network
> 
> cable_modems---Cisco_CMTS---dhcp_server
> 
> 
> 
>