janpi wrote:
>
> Hello,
>
> I am very new to Linux Kernel-AX.25 an TCP/IP in AX.25.
> I am wondering about a big Packet Loss of 30% and more
> on a "low distant connection" via Radio (and only a
> few hops, but these hops might be part of the Problem).
[...[
> * There are special IP-Modes chooseable via axparms and
> for the Xnet-Nodes. What does it mean? (DG and VC)
Yes, that's the KEYPOINT !
In order to take advantage of the flexnet links, you must use VC
(Virtual Circuit) mode.
VC mode means that an ax25 connection is opened and inside it the ip
datagrams are transported.
If you use DG (Datagram), flexnet digipeaters will work as stupid
digipeaters, that is they will retransmit blindly information. The loses
between the digipeaters aren't detected, no one detect them: not you,
not the digipeaters. This loses grows very speedy, the probability of
error is the product of each interlink error.
If you use VC:
- Your link layer will detect errors, and restranmit.
- The flexnet network detect packet loses in the link they happen, with
local retransmission (you don't see them on your side, the network mask
them).
> * In the current configuration I have to add ARPs
> manually. How can this be done automatically? (I want,
> that others can use the Machines for TCPIP connections.)
I have thinked about that. The solution would be to create some ARPs
servers in the network. For example a node with call QST-0. But if you
want it 100% automatic, the solution pass by changing flexnet to support
broadcasting.
> Please help, reading and reading the Manual again and again
> doesn't help me in this moment anymore but makes me sick ;-)
I see that you have read it very well :-)
--
Saludos de Juli�n
-.-
