From: Tomi Manninen (hxc@experian.com)
Date: Tue Sep 25 2001 - 02:23:18 EEST
On Mon, 24 Sep 2001, pa3gcu wrote:
> On Sunday 23 September 2001 21:00, Tomi Manninen wrote:
> >
> > This is the problem. Linux netromd doesn't recognize these as routing
> > messages. Netromd only listens to broadcasts addressed to NODES. Unicasts
> > to a specific address are not supported. What software sends these? Can it
> > be fixed to use the standard broadcast destination address? Or is there
> > another problem (related to axip perhaps) why such unicasts are used?
>
> But linux does write callsigns heard to its nodelist (or so it seems) but
> they get added with an asterisk as mnemonic. My nodelist is full of them and
> they do seem to be unconnectable as well. I have 40 such nodes now in my
> nodelist total nodes are 750, in % not such a big deal but an enoying problem
> to say the least.
Yes, if an NETROM information frame from an previously unknown neighbour
and/or node, destined to any of our netrom interface callsigns is heard,
the kernel (note: kernel, not netromd) adds an automatic return route
(both neigbour and node entry as needed) with zero quality. It does this
so that it would have even half a chance to answer it. The mnemonic will
be empty as an information frame does not contain one. All the other
NET/ROM implementations do the same.
Those routes should not be unreachable but it often happens that another
"better" route to that particular node already exists and that "better"
route is in fact unreachable. NET/ROM isn't particularly good protocol in
that sense...
But the problem was about routing broadcasts. Sending routing info as
unicasts directed to one station seems to be one of the numerous
non-documented extensions to the protocol. Fortunately it's pretty
simple to extend Linux netromd so it will accept such broadcasts as well.
Apparently I have done some of the work already as Arno told us. Thanks
Arno, I had completely forgotten about that. :)
-- Tomi Manninen Internet: ngxc@pascalls.co.uk OH2BNS AX.25: hps.sqxto@roskapostia.tunk.net KP20ME04 Amprnet: plp.isqyrakqiy@accu-find.com- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to terhi.victor@logonet.com More majordomo info at http://vger.kernel.org/majordomo-info.html
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