[Xastir] UDP frames

[Andreas Junge, N6NU]

... and the WRT54G's have an internal serial port!!! Maybe we even can
hookup a TNC.

Andreas, N6NU

> -----Original Message-----
> From: xastir-bounces at xastir.org [mailto:xastir-bounces at xastir.org]On
> Behalf Of jeff at aerodata.net
> Sent: Tuesday, January 11, 2005 8:57 AM
> To: xastir at xastir.org
> Subject: Re: [Xastir] UDP frames
>
>
> 802.11b mac layer is not ax.25. In fact, lots of nice little bells and
> whistles we should take advantage of.
>
> Default mode of 802.11b clients is to do a active scan of the channels,
> seeking a specific SSID (or in the case of 'all', any ssid). So channel is
> almost irrevelent in the case of AP's (BSS).
>
> Consider WRT54G's for your AP's. Not the best, but certainly one of the
> most flexiable (run open source linux) and very cheap (street price
> $55-65).
>
> Since we are doing low bandwidth applications such as APRS, "store and
> forward" will not make large demands on the throughput. The WRT54's (and
> many other) AP's support WDS (Wireless Distribution System) mode, which is
> a crude form of mesh networking. So, you'd have one connected AP, and then
> sprinkle WDS enabled AP's along your proposed route. And remember, the WDS
> enabled AP only needs power.
>
>
>
> > Thing of coordinating frequency and SSID in adhoc mode just like
> > coordinating
> > frequency and PL...  Sure there's gotta be coordination.
> > /a
> >
> > J. Lance Cotton wrote:
> >> Alan Crosswell wrote:
> >>
> >>> Bill Vodall wrote:
> >>>
> >>>> Hmmm.   Taking this a bit further.  Won't an 802.11x device
> have to be
> >>>> in ESS (peer-to-peer mode) instead of IBSS (controlled by an Access
> >>>> Point)
> >>>> before it can pick up raw UDP packets?    This shouldn't be hard to
> >>>> test..
> >>>
> >>>
> >>> Nope.  UDP is just UDP.  What the infrastructure (or lack thereof)
> >>> does is irrelevant.  Think of it as working simplex (ESS) vs. working
> >>> via a repeater/digipeater (IBSS) is all.
> >>
> >>
> >> Except that if your 802.11b card is blasting away UDP packets in ad-hoc
> >> mode with the 'ssid' set to "abcd" and my 802.11b card is sitting next
> >> to it in ad-hoc mode with the 'ssid' set to "wxyz", my card
> doesn't hear
> >> anything from yours. So there has to be some amount of coordination.
> >> It's obviously not the same as AP association, but it's
> similar. Kismet,
> >> the 802.11 sniffer requires that your wireless card driver allows the
> >> card to be put in 'rfmon' mode, which is like promiscuous mode
> for wired
> >> ethernet. There has to be some kind of 'association' using the ssid or
> >> you have the equivalent of an ethernet card with no cable plugged in.
> >>
> >> Now, if we could get a wedge program that would turn on rfmon mode in
> >> the wireless driver, then we could have a 1-to-1 equivalent with
> >> AX.25/APRS...
> >>
> >> -Lance
> >>
> >>> You use UDP all the time when you watch streaming video or other
> >>> applications like that which can tolerate some packet loss and keep
> >>> working.  You drop some video packets, the picture just gets a little
> >>> jumpy but it keeps working.
> >>>
> >>> /a
> >>>
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> >>
> >>
> >>
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