Hi,

it doesn't work. MTU is 4400 and XMITBUFSIZE is 8232 (see online manual "TCP/IP 
for OS/2 Command Reference", search for
"mtu n"). Our network guy sniffers the communication between the OS/2-client 
and the MVS-server. During TCP-initialization the
OS/2-client says the server "512 byte is my MAXTCPFRAMESIZE". I guess 512 byte 
the minimum / default setting for this
parameter. Any idea ???

Ulrich

===================================================================

On Fri, 26 Sep 1997 12:57:56 -0400, Chris Zaremba wrote:

>Ulrich,
>
>Yes, you can tune the TCP/IP transmission unit size on OS/2.   Select the 
>TCP/IP
>Configuration icon from the TCP/IP folder (this may be in the OS/2 System
>folder).
>Go to the Network TAB and select the ADVANCED options.  You can set the
>Maximum Transmission Unit there.  I would recommend at least 2048...you may
>even try 4096 if your network routers and  gateway to the MVS system are
>configured to handle that.
>
> I typically see data transfer rates of between 500 and 700KB/sec in a similar
>environment to yours.
>
>Chris Zaremba
>RBS Project Manager
>IBM Global Services , Endicott, NY
>Ph:(607) 752-2331  FAX: (607) 755-2850
>internet zaremba AT us.ibm DOT com
>