Freerunner corrupts dhcp forwarding of Linksys WRE54G wirelessrange extender

Joel Newkirk freerunner at
Sat Jan 17 07:49:03 CET 2009

On Fri, 16 Jan 2009 18:38:08 +0200, Timo Juhani Lindfors
<timo.lindfors at> wrote:
> Jan Vlug <jan.public at> writes:
>> Resetting the WRE54G by unplugging it fixes this problem.
>> I am surprised by this behavior because in theory, the WRE54G should
>> only forward network packets...
> Can you capture the network traffic to file and put it online
> somewhere? It would be useful to see both the working and non-working
> case.

Indeed this is odd.  A traffic cap from the DHCP server would be quite
helpful, if it's capable of that.  If it's a linux box, then "tshark -i
eth0 -f 'udp port 67 or udp port 68' -w dhcpsniff.cap" should stuff full
packets into the designated file - alter the interface designation as
needed.  The resulting file will be a binary capture that can subsequently
be opened and analyzed by tshark and wireshark, among other programs.

It'd be good if you could capture samples of:

A successful DHCP request from a PC.

The successful DHCP request from the FreeRunner.

A failed DHCP request from the same PC once the FR request has processed.


Joel Newkirk      (blog) (FR stuff)

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