From: Tomi Manninen (nkb@ess.fi)
Date: Wed Oct 31 2001 - 02:21:37 EET
On Wed, 31 Oct 2001, Wilbert Knol wrote:
> You are probably using an exponential back-off scheme. This means, the
> interval between SABM attempts keeps doubling. I have a feeling this is
> the default.
Actually "linear" seems to be the default (had to check the kernel
source...).
> Suggest you go to "linear" back-off (which is in reality a fixed interval),
> and set your frame acknowledge time (FRACK) short enough for the
> ISS/PCSAT pass.
And here also a slight correction: "linear" means that the time between
attempts increases linearly. That is the second interval is two times the
first, third interval is three times the first and so on. There is also a
backoff type "none" which means a fixed interval all the time.
Anyway one should also remember that during the QSO the round-trip-time
estimate is constantly adjusted and the intervals are relative to this.
> All this is done by writing numbers to a bunch of files, and it is probably
> mentioned in the ax25 howto. From my fast-fading memory, it is in
> /dev/proc/ax25/<interface_name>/
/proc/sys/net/ax25/<interface_name>/ to be exact ... :)
> John, N8UR, has an excellent web site at:
>
> http://www.febo.com/linux-ax25/
Yes, that is definitely suggested reading.
-- Tomi Manninen Internet: tab.sywpb@vinita.lt OH2BNS AX.25: inej@speedy.com.ar KP20ME04 Amprnet: fzvmqa.azflteaj@ostrzeszow.com- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to tkza.hvjdmi@risoe.dk More majordomo info at http://vger.kernel.org/majordomo-info.html
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