Because the MP3000 is passing the data through OS/2 you have to use 1492 as the MTU. OS/2 appends 8 bytes to the packet for some reason. This has been a sticking point with the MP3000, IS, and P/390 for a long time.
Alan Cox wrote: >On Fri, 2002-06-07 at 12:36, Christopher Gombola wrote: > >>This fixed my problem. The entire lab uses MTU=1500, when I changed to >>1492, everything worked fine. So in the case of a multiprise 3000, there >>must be an MTU mismatch to get anywhere. Good grief! >> > >I suspect its something else. 1500 is the ethernet MTU, and even if >there was a mismatch with another LAN things ought to work properly due >to the way TCP/IP does mtu discovery between networks. > >Your 'weird it works with 1492' is the kind of thing which makes the >network administrators nervous. Its a bit like "The brakes are a bit odd >but I use the handbrake when driving instead" 8) >
