RE: TCPKEEPALV Parm

["MCPARTLAND, Susan" <susan.mcpartland@xxxxxxxxxx>]

Phil,

Thanks for your response.  I'm actually trying to solve a couple of 
problems where error messages are showing up in the QNPSERVS and 
QTGTELNETS host server jobs for our TCP/IP connected PCs running CA400 
V3R1M3.  A Supportline representative happened to mention the change 
to TCPKEEPALV while we were discussing the other problems.  I tried to 
find out detailed info on TCPKEEPALV and didn't find much.  I'm very 
hesitant to make the change since I had a suspicion that what you told 
me may happen (additional load on the network due to the probe/query 
being sent out more often).

Susan McPartland
Bently Nevada Corp
Minden, NV

----------
From:  Phil Hall[SMTP:hallp@ssax.com]
Sent:  Monday, April 20, 1998 3:17 PM
To:  MIDRANGE-L@midrange.com
Subject:  Re: TCPKEEPALV Parm

Susan,

> What is the impact of changing the TCP attribute TCPKEEPALV from 
the
> default of 120 minutes to 1 minute?  This was recommended to solve 
a
> couple of TCP connectivity problems.

This will set OS/400 to send a probe packet out on all connected TCP
connections, to determine if the 'other end' is still 
there/responding.
If the other end doesn't respond, the local socket will be issued a
SOCKET_ERROR and te application using the socket can act accordingly.

Every 1 minute seems a little drastic for sending out probes, and 
depending
upon the number of connections to your machine, this could potenially 
flood
your network (albeit with very small packets).

What are the underlying 'TCP connectivity problems' is the question 
I'd be
asking (and trying to solve)...

--phil

--
Phil Hall
________________________________________________

email . . . . : hallp@ssax.com
phone(w). . . : (312) 258-6319

News/400 C/C++ Forum moderator at;
       http://www.news400.com/c/index.htm
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