DHCP relay IP and gateway IP, possible bad logic?

Alan DeKok aland at deployingradius.com
Fri Mar 1 16:12:38 CET 2013

Igor Smitran wrote:
>  In case when freeradius is talking to a DHCP relay it should *always*
> send answears to a initiating relay IP. But, it doesn't.

  Can you supply the debug output?

> Cisco CMTS is using as his giaddr for all requests made by
> CM's, MTA's and CPE's.
> All replies should go to

  Usually... there is are some weird requirements on how DHCP operates.

> But, currently, if CPE gets public IP with gateway
>, freeradius tries to send reply to instead
> of

  The DHCP code ignores the *routing* gateway address.  It instead uses
the DHCP giaddr field to send responses.

  Again, debug output would help here.

  Alan DeKok.

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