Hi John --
I missed your original posting or I would have followed up. I'm not
sure, but I think the problem you're seeing is due to the callsign
substitution that's done by the Linux call programs. The problem is
that there is a fixed callsign to IP address mapping in the axip
routing tables. If a user connects via call or node, his own callsign
will be used as the source call. Data routed via the axip link will
travel out, but the node at the far end will see the user's callsign,
and have no idea what to do with it. So, data will go in but won't
come out.
To test this, try connecting using the same callsign as the one defined
as the axip link address. If that works, this is the explanation.
I believe this isn't a problem in xNOS axip gateways, because they use
a separate link callsign for every axip route, and the call translation
is done locally -- in other words, the axip link looks like a digi path
and the user callsign doesn't affect routing. Linux, on the other
hand, uses only a single call for all the links, and therefore has to
rely on the source callsign to gain routing info.
Bob Meyer has done a couple of things that work around this problem.
He's created a version of the call program that lets you set the source
callsign to whatever you want, which can solve the problem in some
cases. He's also come up with a modified version of ax25ipd that, I
think, may be the real answer. I haven't tried it yet, but from a
message Bob posted some time ago, it apparently learns the route for a
callsign from the initial connect request, and builds a routing table
accordingly. It that means what I think it does, it sounds like the
real answer. You can get the modified ax25ipd at ftp://bob.midtown.net/
ax25ipd/ax25ipd. The call program is at the same site, but I don't
have the exact URL handy.
I also have some discussion of this at my web site,
http://www.febo.com/linux-ax25/index.html.
Hope this helps!
73,
John N8UR
[EMAIL PROTECTED]
> Well at least you got more replies than I did when I asked about the
> mysteries of the apparently undocumented AX25 to TCP/IP gateway - and
> why it seems to work only one way for me ... I can connect to a
> DXCluster, through a remote TCP/IP gateway, and receive data, but
> anything sent to that Cluster by me after the initial connect (using
> AX25) gets an ACK from the gateway and then vanishes.
>
> Connecting to an AX25-based DXCluster via AX25 links via the same TCP/IP
> gateway, and using exactly the same syntax (c xxxxx), results in a
> normal two-way link. This used to be what I got with the TCP/IP
> connect ... until something changed, somewhere.
>
> The two replies I did get were very helpful in confirming that the
> problem is not at the DXCluster end, but it seems that the gateway owner
> may need to find out how the latest AXIP daemon differs
> from the previous version and how it is (or should be) set up.
>
> Yes, the standard RTFM reply would be fair comment, if I knew where the
> FM was in the first place.
>
> Maybe this is a bit too basic and I should try the Linux newbie list ?
>
> John G3JAG (using SuSE 6.4 and kppp)
>
>
> On 28-Jul-2000 Mark Aitken wrote:
> > Hello,
> >
> > come on guys, I am a HAM, and I am into computers and the internet
> > so
> > where is a more obvious place to find help than from others that
> > share a
> > common interest.
> >
> > As to "why did I place a help request for kppp on a ham newsgroup and
> > not a
> > linux newbie".
> >
> >
> > 1. I use the internet for ham radio related uses so WHY NOT place a
> > help
> > request here.
> >
> > 2. I am by no means a LINUX NEWBIE, I have played with linux since
> > SLACKWARE 3.2, kernel 2.0.27 (had 2.0.19 at one stage can not
> > remember why).
> >
> > I have mearly had a problem with my configuration and wanted some
> > help with
> > persons of similar interests!!!!!!!
> >
> > So, there, I am over it now, and will ALWAYS ask for and offer
> > assistance to any ham that I can when I can, unlike you people who
> > replied
> > negitavitly to my post.
> >
> > All the best
> >
> > Mark
> > Regards
> >
> > Mark
>
> ----------------------------------
> E-Mail: John - G3JAG <[EMAIL PROTECTED]>
> Date: 29-Jul-2000
> Time: 00:33:23
>
> This message was sent by XFMail 1.4.6-1
> ----------------------------------
--
John Ackermann N8UR
Dayton, Ohio, USA
[EMAIL PROTECTED] -- http://www.febo.com
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