CPE with static IP address

David Ganor david at oliver-solutions.com
Mon Jan 14 08:53:33 UTC 2013

Hi Sztrepka_Pál,
Option 82 is related to, and added by, a DHCP-relay (look for RFC#3046), which is an entity between DHCP-clients and a DHCP-server.
In a DOCSIS network the DHCP-Request from a CPE (connected to an CM) is "trapped" by a DHCP-relay in order to forward it to the DHCP-server with option#82 added to the frame.
I think that the solution you're looking for (at least part of it) is to set up a DHCP-relay and config it to add the required information.

David Ganor

-----Original Message-----
From: dhcp-users-bounces+david=oliver-solutions.com at lists.isc.org [mailto:dhcp-users-bounces+david=oliver-solutions.com at lists.isc.org] On Behalf Of Sztrepka P?l
Sent: Monday, January 14, 2013 10:29 AM
To: Users of ISC DHCP
Subject: Re: CPE with static IP address

2013-01-13 10:54 időpontban Simon Hobson ezt írta:
> Sztrepka_Pál wrote:
>>With Cm and mta there is no problem, those work, but the problem is  
>>the CPE.
>>I don't understand, how can I define a CPE Host decl with static IP 
>>address, even not knowing the MAC Address of the CPE?
>>Maybe there is a solution for this thing, only I am uninformed?
> AIUI in such a setup, address allocation to the CPE is done by way of 
> an identifier introduced into the DCHP packets by the cable modem. So 
> you go by the identity of the modem supplied to hte customer.

Hi Simon.

Do you think Option 82, is not it?
Really my question is, that whether can I do this with regular ISC DHCP config statements
  or options (like hardware ethernet - fixed-address pair) without sniffing the DHCP discover packets or processing the dhcpd.log?
If anybody would a revelant config part, I thank to him.


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