Alan, Thanks for your reply, but we do have the MTU sizes matching at both the Linux and OS/390 ends of the ctc connection. For the testing I am referring to, we change the MTU on Linux with an IFCONFIG CTC0 MTU cmd and then do NETSTAT -I to check. At the OS/390 end my network colleague stop/starts the ip stack changing the MTU to match the Linux end in the process.
Thanks, Eric Lawler. -----Original Message----- From: Alan Altmark [mailto:[EMAIL PROTECTED]] Sent: 10 December 2001 15:02 To: [EMAIL PROTECTED] Subject: Re: Problem with Virtual CTCs between VM Linux guests and OS/390 2.10 IP Stack. On Monday, 12/10/2001 at 11:49 GMT, Eric Lawler <[EMAIL PROTECTED]> wrote: > I must say the Linux VM ctc connection to OS/390 does not seem very robust. > We have no problem sending data from OS/390 to Linux at any matching MTU > value eg 1492. > > Any further suggestions eg Linux buffers ? The MTU sizes on both sides of the CTC connection must match. Make both sides 32768 or something. (VTAM CTC connections have the same issues! If the buffer sizes don't match you get truncated PIUs...) This is the nature of the CTC hardware (virtual or real). Regards, Alan Senior Software Engineer z/VM, TCP/IP, VIF, and Linux for zSeries Development, Endicott, NY Phone 607.752.6027 fax 607.752.1497 t/l 852 Internet communications are not secure and therefore the Barclays Group does not accept legal responsibility for the contents of this message. Although the Barclays Group operates anti-virus programmes, it does not accept responsibility for any damage whatsoever that is caused by viruses being passed. Any views or opinions presented are solely those of the author and do not necessarily represent those of the Barclays Group. Replies to this email may be monitored by the Barclays Group for operational or business reasons.
