Re: [lwip-users] DHCP issues

[Ed Sutter]

Tom,
My limited experience with ethereal has shown that
if you're on an isolated network (low traffic) and set
ethereal up to just capture everything, then you should
see your packet regardless of how messed up it gets.
Ed

"Tom C. Barker" wrote:
> 
> Thanks Leon,
> 
> I mis-stated. My sniffer can see the 4-part DHCP transaction
> from other devices I have. But that's not the really the problem.
> The problem is that the packet may be going out malformed and
> thus is never picked up by ethereal and the DHCP server.
> More importantly, I never get a DHCPACK. This is the issue.
> Any ideas?
> 
> Additionally, for your 5272 driver, is it necessary to do
> transmit cleanup as another task? Why is pbuf_free() an issue
> inside a receive->response/tx/pbuf_free()?
> 
> Thanks,
> Tom
> 
> -----Original Message-----
> From: Leon Woestenberg [mailto:address@hidden
> Sent: Friday, November 21, 2003 7:42 AM
> To: Mailing list for lwIP users
> Subject: Re: [lwip-users] DHCP issues
> 
> 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.
> 
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