John Cusick wrote:
> Essentially, what are the differences and why or when would I
> choose one and/or the other?
Hello John, as you see there is a variety of opinions !!
My conclusions are:
If you have a very good link with the gateway of your subnetwork, use
datagram.
If you have a bad link, use connected mode.
If your link is a normal link, then feel free to do experiments :-)
For me, the conclusions of my experiments is that the interaction of tcp
with ax25 depends of the the IMPLEMENTATION of TCP, in concrete with the
Initial retransmition timers.
With Linux I am having problems in VC mode, because:
- IRRT value given in the route command is only used before the ACK SYN
is received (the connection is established). After it is reseted. So for
example if I use a client like Netscape, the fisrt request is beeing
retransmited very much !!! For example I can wait be 2 minutes or more
retransmiting the 5 o 6 times the first "GET http://... [lot of stuff
generated by Mozilla]." I don't know it that has been improved in 2.2
series. This improvement is compatible with RFC.
- TCP maximum retransmition is 2 minutes. So if your packets take more
than 2 minutes to cross the network, tcp generates congestion. This
behaviour of 2min is imposed by the RFC, but jnos didn't implement it,
wich is better for us.
With jnos VC worked very well. With Linux I am seeing that ax25 is not
working well, this added to the Linux TCP features do that VC is not
working well in Linux.
But I still use it, because I want to track all the improvements in this
field.
--
Saludos de Julian
-.-
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