Freeradius DHCP IP pool and not correct port for DHCP

[Alan DeKok]

Thomas Bru wrote:
> When the renewal DHCP packets are send using unicast, my client try to
> reach FreeRadius. he send DHCP request using his IP address with source
> port 68 and the freeradius IP Address with destinatio port 67.
> My IAD source pat the flow using a dynamic random port.

  That is not how DHCP works.

  DHCP clients use a source port of 68.  DHCP relays use a source port
of 67.

  Your IAD (whatever that is) is broken.  Replace it with something that
does DHCP properly.

> I don't understand why Freeradius will not reply to the initial source
> port ?

  Because DHCP is insane.  The replies do *not* cause the src/dst ports
to be swapped, as with every other UDP protocol.

>> 3) This packet trace is not evidently the first requests, but a renewal?
> You're true, i see the problem only on the renewal (When 50% of the
> lease time have been reached).

  Then look at the packet traces to see how the first request is
different from the renewal.

  Alan DeKok.