host-identifier and option 82

[Glenn Satchell]

Hi Michal

There is a dhcp server configuration option to cover this very case, from
the dhcpd.conf man page:

          stash-agent-options flag;

          If the stash-agent-options  parameter  is  true  for  a
          given  client,  the  server will record the relay agent
          information options sent during  the  client's  initial
          DHCPREQUEST  message when the client was in the SELECT-
          ING state and behave as if those options  are  included
          in  all  subsequent  DHCPREQUEST  messages  sent in the
          RENEWING state.   This  works  around  a  problem  with
          relay  agent  information  options,  which is that they
          usually not appear in DHCPREQUEST messages sent by  the
          client in the RENEWING state, because such messages are
          unicast directly to the server and not sent  through  a
          relay agent.

regards,
-glenn

> Hi,
>
> I've just tried to use host-identifier to assign static IPv4 address based
> on option 82 agent.remote-id like this:
>
> host hostname {
> host-identifier option agent.remote-id XX:XX:XX:XX:XX:XX;
> fixed-address aaa.aaa.aaa.aaa;
> }
>
> this apparently works until client renews its IP address. DHCPREQUEST is
> going directly from client to server bypassing relay agent which means
> that there is no option 82 inserted when client is trying to renew
> address. So server is unable to match DHCPREQUEST against host
> declaration. Am I right in this? Is there any workaround? Any clue?
>
> thanks
> michal
>
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