From: pa3gcu (njwmr@hemphillmafia.com)
Date: Sun Sep 30 2001 - 17:06:50 EEST
On Saturday 29 September 2001 15:47, Tomi Manninen wrote:
> On Sat, 29 Sep 2001, pa3gcu wrote:
> > Firstly they do get propergated, secondly the nodes with the asterisk
> > given to them by the kernel get repropergated as well and on top of that
> > they all have a quality and certainly not "0".
>
> Ok. What I said above is slightly wrong. Linux will not propagate routes
> with quality=0. If a netrom frame arrives from an unknown neighbour, linux
> creates a return route entry with empty mnemonic and a quality of 0. Those
> automatically created entries are thus not propagated. If you see such
> broadcasts (originating from you), that's a bug.
>
> > No i dont see asterisks in broadcasts, what i see is the following.
> >
> > axip: fm XE2EBC-5 to NODES ctl UI^ pid=CF(NET/ROM) len 238
> > NET/ROM Routing: CICESE
> > DB0CRL VE1DRG-7 147
> >
> > I then see with cat /proc/net/nr_nodes | grep -e "*"
> > DB0CRL-0 * 1 1 137 3 00006
>
> Ok. So XE2EBC-5 claims it knows DB0CRL. He also claims DB0CRL doesn't have
> a mnemonic. What should we do?
>
> We could ignore the entry but I'm not sure that is really correct. I don't
> think the NET/ROM spec explicitly says every node must have a mnemonic.
> However maybe we should add a switch to netromd for this anyway.
I would prefer a switch, that way we would then be in command being able to
have want we want and not what others choose to send us.
>
> > > If, on the other hand, you see a broadcast with an empty mnemonic field
> > > then that is something I'd like to know more about. I don't think this
> > > is possible either however.
> >
> > I'm afriad it is.
>
> I now see how it is possible. It's however not something we can do much
> about. Except that we can ignore broadcasts that propagate those (and in
> effect call the neighbour a "liar").
>
> > axip: fm W5DAV-7 to PA3GCU-9 ctl SABM+
> > axip: fm PA3GCU-9 to W5DAV-7 ctl UA-
> > axip: fm W5DAV-7 to PA3GCU-9 ctl I00^ pid=CF(NET/ROM) len 238
> > NET/ROM: YO4GAB-2->PA3GCU-9 ttl 66
> > protocol family 43, proto 55
> > axip: fm PA3GCU-9 to W5DAV-7 ctl RR1v
> >
> > Now YO4GAB-2 shows up in my nodelist with an asterisk and a quality of
> > "0"
>
> These are the automatic return routes I have been talking about. Every
> existing NET/ROM implementation does this. Your station won't propagate
> these forward however.
>
> Again we could make the kernel ignore these. It would need to be settable
> however as I think it's not quite the right thing to do in all situations.
I would prefer not to have them as they do not do anything.
>
> > In those packets are hidden nodes, note listen -a does not show the data
>
> Listen does not show the data as it doesn't know how to do it. Maybe we
> should make listen do an ascii dump of the content here.
That would be very helpfull.
On another note would it not be better if the origin of the bogus
transmissions was detected and repaired, it seems most fingers point to Tnos
at this minute.
On another note i received a mail from a fried who showed me that some stn's
using Xnet are propergating nodes with a quality of zero, so it looks like
there are more problems with different software around.
-- Regards Richard qpq.unobnxcut@andebakken.dk http://people.zeelandnet.nl/pa3gcu - To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to owerk@rele.tunk.net More majordomo info at http://vger.kernel.org/majordomo-info.html
This archive was generated by hypermail 2b30 : Sun Sep 30 2001 - 17:25:58 EEST