topic Re: keepalive in Operating System - OpenVMS

keepalive

Janet MacDonal — Thu, 15 Sep 2005 10:31:13 GMT

I have 10 Intermec CK30 scanners that I cannot keepalive on OpenVMS (TM) Alpha Operating System, Version V7.1-1H2. After about 5 minutes of inactivity on the scanner it drops me from the Alpha box. Symbol scanners are no problem. There is no setting on the scanner or access point to control this. Does anyone know, I assume the proper UCX command?

Janet

Re: keepalive

Ian Miller. — Thu, 15 Sep 2005 10:53:34 GMT

Does this
http://h71000.www7.hp.com/doc/732final/6631/6631pro_005.html#index_x_148
help?

Which version of UCX are you using and what protocol is used to connect to the scanners?

Re: keepalive

Janet MacDonal — Thu, 15 Sep 2005 11:19:31 GMT

Thanks Ian

I have read that link and these are my settings
SHOW PROTOCOL TCP/PARAM
TCP
MTU SIZE SEGMENT: DISABLED
DELAY ACK: ENABLED
LOOPBACK: DISABLED
WINDOW SCALE: ENABLED
DROP TIMER: 600
PROBE TIMER: 75

RECEIVE SEND

CHECKSUM: ENABLED ENABLED
PUSH: DISABLED DISABLED
QUOTA: 4096 4096

UCX> SHOW VERSION

DIGITAL TCP/IP SERVICES FOR OPENVMS ALPHA VERSION V4.2 - ECO 1
ON A ALPHASERVER 800 5/500 RUNNING OPENVMS V7.1-1H2

Re: keepalive

Michael Yu_3 — Fri, 16 Sep 2005 02:47:23 GMT

Hi Janet,

Are these scanners connected to a particular TCP/IP application/service?

For earlier versions of UCX, the inactivity timer of a service may be effective.

Thanks and regards.

Michael

Re: keepalive

Wim Van den Wyngaert — Fri, 16 Sep 2005 03:20:23 GMT

To my knowledge there is no way of setting keepalive for all connections in UCX.

If your scanner is using a known service, a logical ucx$_keepalive may save you.

Check the doc of your scanner.

Wim

Re: keepalive

Wim Van den Wyngaert — Fri, 16 Sep 2005 04:03:59 GMT

Probably the CK30 has a program running on VMS for which you have the source code. You can specify the socket option in that source (e.g. no keepalive anymore).

As I understand it, the CK30 can go into suspend mode and is then not reacting to keepalive packets. Reconfigure ucx so that keepalive is no longer 5 minutes but a lot longer (ucx sho prot tcp/pa + help ucx set prot tcp , probe and drop). But then all connections on your system will have a longer keepalive.

Or disable the suspend on the ck30 ...

Wim