Re: [lwip-users] DHCP issues

[Leon Woestenberg]

Hello Tom,

> I have confirmed DHCP performing a discover and getting 
> an offer and then formatting and transmitting a request
> but the sniffer doesn't see the request. Has anyone run into
> this issue? 0.6.4, Coldfire 5282, gnu/gcc/insight
>
As already hinted; you are probably not seeing all the traffic
with the sniffer, but only the broadcast traffic.

Make sure that the link the sniffer also sees the traffic
of unicast traffic. This can be achieved by using a
Ethernet hub instead of a Ethernet switch.

Hubs forward all traffic to all ports.
Switches forward unicast traffic to the corresponding MACs
discovered on the ports, and broadcast to all ports.

If possible, run the network sniffer on the DHCP server.

To develop lwip/dhcp.c, I used a Linux DHCP server
running Ethereal (.org).

Regards,

Leon.