x.25 setting, msg sent intermittently stopped.

[Sir T S S]

our client application using x.25 to send message to sun server and intermittently stopped .
We need to explore the X.25 speed and number message transaction between the sender and receiver.

I checked from book that some term used like Xon and Xoff might affect the transmission. There might be other options and parameters in the regrards of speed and amount message transaction controlling.

Any helps is appreaciated.

Thanks.

[Jim Keeble]

X-on and X-off parameters would only be relevant if you are using a PAD device using X.29 protocol over the X.25 link.

Your application would be connecting to the remote computer and accessing the remote application using a psuedo-tty device on the remote.

If your application uses BSD sockets to connect over X.25, X-on and X-off are not in play.

If the hangs are caused by X.25 protocol config errors and not application logic problems, the most likely parameters to be involved are :

Layer 2 Window Size (l2window)

which must match the setting of the next hop x.25 device (either the switch or the remote system) and

Packet Window Size

(pvc_inwindow,pvc_outwindow) for PVC's

The are hard-coded in the X.25 config

(def_inwindow,def_outwindow) for SVC's

These defaults are hard-coded in the X.25 config, but can be negotiated during the call setup by the applications.

Assuming we are talking about HP's X.25 products, these are found in the X.25 config file, usually /etc/x25/x25config_ and can be read from the stack with "x25stat -c -d "

Hope this helps.