[wpa_supplicant] Ad-Hoc/IBSS with 3+ Nodes
Wed Aug 4 12:14:36 PDT 2010
On Wed, 2010-08-04 at 08:55 -0400, SJB89 at Drexel.edu wrote:
> Dan - Thanks for the info. Surprisingly, the output from iwconfig is
> identical on all nodes. I've done a little more testing since my
> original post and found the following (assuming three nodes only, and
> using group=CCMP in wpa_supplicant.conf):
Does group=TKIP work? Just trying to narrow things down.
> If nodes A and B come "up" first, they can communicate as expected.
> When C comes up, the A and B retain their communication. If, for
> example, A tries to ping C, a series of ARP requests - varying in
> number between 4 and 30+ - are sent from A looking for C's MAC
> address, along with the ICMP_ECHO_REQUEST packets expected from
> running 'ping.' Eventually, 1-10 ARP replies will be sent by C and
> communication between C and A will resemble the communication between
> A and B previously (low latency, no packet loss). However, the process
> of sending these ARP requests causes the first n packets, where n is
> roughly equal to the number of ARP requests sent by A, to not reach
> their destination. If A needs to now communicate with B again, the
> same ARP request scenario occurs, even though there is already an
> entry for B in A's ARP table.
> Manually setting static ARP tables does not fix the problem.
> Additionally, A and B can not simultaneously communicate with C -
> only the first node to successfully pass traffic to and from C can.
> It appears that there is a pairwise authentication occurring that
> adjusts when a new pair begins communicating.
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