FECO 3000 # 26

	FECO:	3000 # 26
	MODIFICATION No:	N/A
	PRODUCT:	NETWARE/X
	SUB-ASSEMBLY	NVT TUNEABLES
	ESTIMATED MAN HOURS	N/A
	CLASS OF CHANGE:	INFORMATIONAL
	REASON FOR CHANGE:	NVT TIME-OUT PROBLEMS

Reason for change

1.              To list the procedure for tuning the nvt time-out parameter. Netware/x must be installed and tested
                 before proceeding with the changes listed below.

Change

2.              There is a feature in netware/x called 'NVT' (netware virtual terminal). This allows pc's on the network
                 to login to unix as though they were on a vdu. It is possible with viaduct to use this feature.

3.              ViaDuct for dos allows users to 'save and exit' from their current unix logon session, without logging
                off first, and return to it at a later stage, including repainting the screen exactly as it was.

4.              With 'viaduct for windows' there are no problems with 'iconising' the current session and returning to
                it when ready. However, when exiting out of 'viaduct for dos' the pc program is terminated (otherwise
                there is insufficient memory to run any other program concurrently). This means that viaduct is no
                longer communicating with 'nvt' on a regular basis.

                (tech serv ref 03/8/2)

5.              After a period of time (approx 30 - 60 seconds), 'nvt' drops the connection with the pc, but leaves the
                unix session still logged on. When the user re-starts viaduct, he has to re-attach to nvt, and is then
                presented with a new unix login message. It is not possible in unix to re-establish a link with a unix
                login session.

6.              There is a tuning parameter 'nvt_max_retrys' in the file 'nvt_tune.h' in the directory
                '/etc/conf/pack.d/nvt'. By default, this is set to 7. Using the 'vi' editor, this parameter should be
                modified to 900. This will allow users at least 1 hour before the nvt session is dropped after viaduct
                has been exited.

7.              Once the parameter has been modified, the unix kernel must be rebuilt, and the system rebooted.

8.              Procedure as follows:

8.1           on the console, log into 'root'.

8.2            using 'vi' modify the entry 'nvt_max_retrys' in the file 'nvt_tune.h' from 7 to 900.

                 # vi/etc/conf/pack.d/nvt/nvt_tune.h

8.3           save the change, and exit from 'vi'.

8.4            rebuild the unix kernel, by entering -

                # /etc/conf/bin/idbuild

8.5          reboot the system, so that the parameter change may take effect, by entering -

                # shutdown -y -i6 -g0

                Recording action

9.              Record the tuning modification on the site record.

Return to index