North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: MTU of the Internet?

  • From: Matthew Petach
  • Date: Thu Feb 05 04:37:38 1998

> Several people have noted to the Microsoft Support and Product groups that
> they want the Windows 95 PPP MTU to be set to 576 (down from 1500).  this
> change is in Windows 98.

Wrong direction.
> The reason for this change cited by many customers is that many ISPs have
> 576 MTUs set "inside" their networks and packets get fragmented.

> How prevelant is this fragmentation and how prevelant is this MTU in ISPs?

It's not.  Quite frankly, I like the 9127 used by Alteon switches
and NICs within our network.  
> Why do ISPs set their MTUs to 576 instead of ~1500 or even ~4K?

We don't.  In fact, we like the MTUs as high as possible, hence
the choice of Alteon, with jumbo frames.
> thanks in advance for your responses,
> peter

You're welcome!  Please take this feedback, and adjust Win2000
accordingly...  :-)