Hello.
On 30/03/16 19:18, Remi Philippe wrote:
On Wed, Mar 30, 2016 at 12:54 PM, Stefan Schmidt <stefan@xxxxxxxxxxxxxxx> wrote:
Hello.
On 15/03/16 06:19, Remi Philippe wrote:
On Tue, Mar 15, 2016 at 3:11 AM, Michael Richardson <mcr@xxxxxxxxxxxx>
wrote:
Stefan Schmidt <stefan@xxxxxxxxxxxxxxx> wrote:
> 2) If the 802.15.4g node uses a SUN PHY with a 2047 byte MTU we
can run into
> trouble with normal nodes only able to handle 127. So far there is
nothing
> specified to handle this case. Michael is proposing to use 6lo ND
for this
> and record the MTU value for this neighbour in the l2 nd cache.
Something
> that would certainly work but would need specing and implementing.
I see this
> as a mid term goal we want to have. Anyone going to work on this?
It's not even clear to me that ND can do this.
I still propose that we want to have a space in the l2 or l3 ND cache for
this info. It could well go in the L3 cache because it is really a
statement
about how the 6lowpan layer should fragment.
> 3) Until 2) is done I would suggest we add a config option
"802.15.4g with
> SUN PHY" which will change the hardcoded MTU from 127 to 2047 and
will thus
> only work for a 15.g with SUN PHY only network. No interop as we
have no way
> of knowing. The option would be disabled by default and the help
text needs
> to mention the drawbacks. Once we have 2) in place we can remove
this.
Couldn't we use "ifconfig blah0 mtu 2047"?
Maybe we should do both, have a flag to specify the PHY type as the
PHY header is slightly different in15.4g MR-FSK to support for mode
switch, data whitening... it needs to support 2 octets header (page 52
of the 802.15.4g-2012 spec) it can also lock the max MTU supported for
the media. And allow to change the MTU from command line.
Did you move on with this? If you ahve any patches let us know. We are
happily going to review them.
regards
Stefan Schmidt
We're still fixing some issues on the AT86RF215 (some timing issues
and bit swapping), then we'll go for the configurable MTU and then
look into the 15.4G. So work in progress, we'll send the patches once
we have something stable!
OK, cool, so its being worked on. Was just going through my pending
mails and wanted to see if there was anything blocking you from our side. :)
regards
Stefan Schmidt
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