[OZAPRS] AX25 under Debian sending non APRS packets

Darryl Smith Darryl at radio-active.net.au
Sun Apr 30 12:27:07 EST 2006 

For those that do not know, The former Project Lead on the Debian Project,
Bdale Garbe is not only a ham, but a really really active ham. He is a
former board member of TAPR I believe, and of Amsat... 

Darryl

---------
Darryl Smith, VK2TDS   POBox 169 Ingleburn NSW 2565 Australia
Mobile Number 0412 929 634 [+61 4 12 929 634 Int] - 02 9618 6459
www.radio-active.net.au/blog/ - www.radio-active.net.au/web/tracking/
 

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Craig Turner
Sent: Sunday, 30 April 2006 9:42 AM
To: VK / ZL APRS Users
Subject: Re: [OZAPRS] AX25 under Debian sending non APRS packets

Hi all,

Many thanks for all the responses.

A couple of things that I omitted in my first email.

My home network is 192.168.0.* and my ax25 network is 192.168.1.*

I actually don't need an IP address on the ax0 interface, but kissattach
requires an ip address as the ax25 software treats the interface as a
TCP/IP interface. The more I played with it the more I realised how easy
it would be to set up a local network over radio, something I'd like to
do, but my first priority is not to spam the 145.175 with DHCP or SAMBA
announcements ;-)

I discovered ax25mond which creates a socket (default port 1234) which
allows you to telnet into that socket, either locally or from another
machine and recieve the raw ax25 data through telnet. I left ax25mond
running and telneted into that port. Much of the data appears to be binary
and I can't interpret it, but there is enough text in the stream to
satisfy me that it is a local Samba running on that machine that is
advertising it's existance to all attached interfaces. I've configed Samba
to only use the 192.168.0.* network. There may be some other services
doing 'offers' as well, so I'll need to do some detective work there.

But running Samba or ftp over VHF would be interesting...very slow though!

As to my other question about non root access to ax0, I searched the /dev/
directories and couldn't find ax0, but then nor was eth0 so I'm not sure
if those interfaces appear in /dev

ax0 certainly appears in ifconfig.

Anyway, thank you for all the responses to date,

Regards,
Craig
ex VK8, and as of this week, VK1HCT
--
http://www.craigturner.id.au

Andrew Rich
> Nice one,
>
> Looks like your IP is getting into you ax25 somehow
>
> ;-)
>
> I run aprsd here, but I have not patched the kernel for ax25.
>
> I use a TNC in terminal mode for aprsd.
>
>
>
> -----------------------------------------
> Andrew Rich
> Amateur radio callsign VK4TEC
> email: vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
> web: http://www.tech-software.net
> Brisbane AUSTRALIA
>
>
>
> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au]On
> Behalf Of Craig Cook
> Sent: Saturday, 29 April 2006 9:17 PM
> To: VK / ZL APRS Users
> Subject: Re: [OZAPRS] AX25 under Debian sending non APRS packets
>
>
> Adrian, this msg notintended for me. Craig Cook VK3CMC.
>
> 73
>
> ----- Original Message -----
> From: "Adrian Snell" <rfhead at internode.on.net>
> To: "VK / ZL APRS Users" <ozaprs at aprs.net.au>
> Sent: Saturday, April 29, 2006 16:17
> Subject: Re: [OZAPRS] AX25 under Debian sending non APRS packets
>
>
>> Additional thought acually TCP chat wont work to capture the UDP data.
> just
>> grab it from the serial port using a terminal program.
>> ----- Original Message -----
>> From: "Adrian Snell" <rfhead at internode.on.net>
>> To: <craig at craigturner.id.au>; "VK / ZL APRS Users"
<ozaprs at aprs.net.au>
>> Sent: Saturday, April 29, 2006 3:45 PM
>> Subject: Re: [OZAPRS] AX25 under Debian sending non APRS packets
>>
>>
>> > Hi Craig
>> > It appears that 192.168.1.1 is sending a broadcast (assuming the net
> mask
>> is
>> > 255.255.255.0). If you can capture the data in the UDP frame (say
with
> TCP
>> > chat) then you can see what the cause is. Depending on what the
routes
> on
>> > the box are, this could be due to other interfaces (ethernet etc) on
>> the
>> box
>> > needing data eg anything from address resolution, SNMP even possibly
> DHCP
>> > etc etc
>> >
>> > Regarding the other problem of needing to be root. This is most
likely
>> a
>> > permissions problem with the dev files. Make sure that whatever user
>> is
>> > going to run the AX25 has read/write permissions for the ax0 device.
>> >
>> > regards
>> >
>> > Adrian VK5ZSN
>> >
>> > ----- Original Message -----
>> > From: "Craig Turner" <craig at craigturner.id.au>
>> > To: <vk3jfk at amsat.org>; "VK / ZL APRS Users" <ozaprs at aprs.net.au>
>> > Sent: Saturday, April 29, 2006 11:24 AM
>> > Subject: [OZAPRS] AX25 under Debian sending non APRS packets
>> >
>> >
>> > > Hi,
>> > >
>> > > I'm running the latest version of Debian and using an TNC-X. I have
>> > > configured AX25 in accordance with the AX 25 How To (I think!!) and
>> am
>> > > running xastir.
>> > >
>> > > I want to run APRSD, so that I can have a headless box relaying
APRS
>> data
>> > > within my home network.
>> > >
>> > > At the moment its all working almost perfectly. I can only use the
>> AX0
>> > > interface as root, so at the moment I have to run xastir as root to
>> access
>> > > the radio port. I am not sure how to resolve this at the moment, it
> may
>> be
>> > > because I am starting the ax25 interface from a console script as
> root.
>> > > Anyway, thats not my main problem...
>> > >
>> > > xastir transmits and recieves fine, but occasionally (appears to be
>> about
>> > > 10 minute intervals, but not 100% sure) the TNC sends a packet that
> goes
>> > > for about 20 seconds or so.
>> > >
>> > > I've managed to decode the packets and they are:
>> > >
>> > > VK1HCT-1>QST>UI,?
>> > >   IP: UDP, Source: 192.168.1.1, Dest: 192.168.1.255, Len: 252
>> > > VK1HCT-1>QST>UI,?,CC
>> > >   IP: UDP, Source: 192.168.1.1, Dest: 192.168.1.255, Len: 33
>> > > VK1HCT-1>QST>UI,?,CC
>> > >   IP: UDP, Source: 192.168.1.1, Dest: 192.168.1.255, Len: 235
>> > >
>> > > 192.168.1.1 being the IP number I have assigned to AX0 port. It
>> looks
> to
>> > > me like some process is either pinging the port or sending a
beacon.
> At
>> > > this point APRSD isn't running.
>> > >
>> > > Any suggestions for where to start looking? I want to be able to
>> leave
>> the
>> > > station on 24hrs a day, but at the moment I don't want it to
congest
> the
>> > > network with these packets.
>> > >
>> > > Regards
>> > > Craig
>> > > VK1HCT
>> > > _______________________________________________
>> > > Ozaprs mailing list
>> > > Ozaprs at aprs.net.au
>> > > http://aprs.net.au/mailman/listinfo/ozaprs
>> >
>> > _______________________________________________
>> > Ozaprs mailing list
>> > Ozaprs at aprs.net.au
>> > http://aprs.net.au/mailman/listinfo/ozaprs
>>
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