Linux-Hams archive - October 1997: Re: Telnet and ax25

Re: Telnet and ax25

Richard Adams (rdj.fpetxp@logitech.com)
Thu, 2 Oct 1997 09:57:28 +0000 (GMT)


According to Pete Rossi WA3NNA, While burning my cpu.:
>
> OK... I have been RE-reading the telnet, route, and a whole bunch of other
> ax.25-utils related man pages today...
>
> ... but this time specifically looking for certain things.
>
>
> OK, I see the irtt parameter for the route command. I tried setting
> it to 5 seconds.. then 10 seconds. Best I can tell --- NO DIFFERENCE.

Then i suggest you are not setting it correctly.
>
> Off the top of my head I would be inclined to say that is not the problem.

Sorry i dont agree.
>
> So the question returns... HOW DOES ONE KNOW WHAT VALUE TO USE?

The IRTT is Initail Round Trip Time, it can be worked out somthing like
this. An mtu of 256 bytes at 1200 baud takes roughly 2 seconds to transmit,
then 2 seconds to be transmitted back from the remote stn, so now we have 4
seconds, add 1 or 2 seconds for any other sigs on freq, and now we have say
6 seconds, so you set you irtt to 6000 like this.

route add 44.xxx.xxx.xxx window 944 irtt 6000 <ifc_name>

>
> So do I just keep guessing until it is right? We may be "amateurs" but
> there has got to be a better way.
>
> I also tried setting the route 'window' parameter... but route would not
> accept it.

You keep asking questions here to the group, have you asked W3BG how he sets
his paramters, he seemed to have an mtu of 256 in the origanal listen trace,
cant remember if he has his window set tho'.

It should understand it, you have still not mentioned exactly what you are
using, you mentioned kernel 2.0.30 and ax25utils, but not which version, if
your having problems, and want a decent answer, please include the following
with your next mail.

kernel version, is the kernel patched with a ax25-modules-xx patch,
ax25-utils version,
and considering you say the window param is not understood by 'route' then
net-tools version. Do 'route -V'

>
> ---
>
> Pete Rossi - WA3NNA
> kwb@abgnetwork.net
>

-- 
Regards Richard, 73.              | "I see" said the blind man to his
AX25  pa3gcu@pi8mid.#zld.nld.eu   |  deaf en dumb daughter, who replyed,
smtp  zzri@aipc.com      | "Yes" Linux AX25. NET/ROM, "I have heard
inet  tvaon@bbsvp.com.br |  that what you see is what you get".