I've been trying to set up a 6LoWPAN network similar to what's
described on the "Getting Started" page [1], only that this is a
mix of Linux and Contiki. It works after solving the uncompression
issues I mentioned in my last post, but there are still a few
things I wonder about:
- why configure all nodes to have an additional link-local address
(besides the fe80::a200:0:0:{1,2,3} they derive from the EUI-64) ?
I.e., this:
# ip addr add fe80::a000:0:0:8/64 dev lowpan0
And why make it the same on all the nodes ?
- the pings seem to try to use the automatically set link-local
address but without flipping the universal/local bit. I.e.,
"Getting Started" says
# ping6 fe80::a000:0:0:3%lowpan1
But it would seem that what is meant is
# ping6 fe80::a200:0:0:3%lowpan1
(Or the additional address that's being set manually would have
to be fe80::a000:0:0:{1,2,3})
- the example doesn't set the address of the wpan0 interface. This
address is compared in mac802154_subif_frame and a mismatch causes
it to classify the frame as PACKET_OTHERHOST while it should be
PACKET_HOST. As far as I can tell, nobody cares about this, but I
wonder if that could become an issue in the future.
To set that address correctly, one would have to
# ip link set wpan0 address a0:0:0:0:0:0:0:1
[1] http://sourceforge.net/apps/trac/linux-zigbee/wiki/GettingStarted-0.2
My instructions for a mixed Linux-Contiki (*) setup are here:
https://github.com/frtos-wpan/frtos-wpan/blob/master/doc/6lowpan.txt
(*) There's one more quirk: I run Contiki under FreeRTOS. But that
only affects the build process, not how Contiki's networking
works.
- Werner
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