RRAS Uses Larger MTU Than Other OSPF Routers

 Last reviewed: December 12, 1997
Article ID: Q104296
The information in this article applies to:
  • Microsoft Windows NT Server version 4.0
  • Microsoft Routing and Remote Access Service Update for Windows NT Server version 4.0

SYMPTOMS

Your Routing and Remote Access Service (RRAS) server that is using Open Shortest Path First (OSPF) is transmitting network packets larger than your other OSPF routers. Therefore, the other OSPF routers must fragment the packets coming from your RRAS server.

CAUSE

RRAS sets the maximum transmission unit (MTU) equal to the specified value in the Advanced properties of the OSPF Configuration dialog box for your OSPF interface; however, other OSPF routers set the MTU to their specified value minus the IP header.

STATUS

Microsoft has confirmed this to be a problem in Routing and Remote Access Update for Windows NT Server version 4.0. This problem was corrected in the Routing & Remote Access Service Hotfix Update. You can obtain this update from Microsoft's World Wide Web Site on the Internet at the following location: 

   http://www.microsoft.com/communications/routing&ras.htm
NOTE: Because the Microsoft Web site is constantly updated, the site address may change without notice. If this occurs, link to the Microsoft home page at the following address: 

   http://www.microsoft.com/

Additional query words: routing protocol
Keywords : kbbug4.00 ntnetserv NTPROTOCOL ntrouter NTSrv nttcp kbinterop kbnetwork
Version : WinNT:4.0
Platform : winnt
Issue type : kbbug

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Last reviewed: December 12, 1997
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