IPX Router Does Not Increase Transport Control Field Value by 1 When Propagating IPX Packets

This article was previously published under Q219323
This article has been archived. It is offered "as is" and will no longer be updated.
Normally, when an IPX packet is propagated by the router, the Transport Control (TC) field is increased by 1. The router does not propagate any packets with TC=16. This guarantees that IPX packetets do not go further than 16 hops from the source. When the TC is not incremented, packets (especially broadcasts) are propagated an infinite number of hops, which has the potential to create huge network storms.
This problem occurs because this functionality was lost with Windows NT 4.0 Service Pack 4.
To resolve this problem, obtain the latest service pack for Windows NT Server 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
Microsoft has confirmed that this is a problem in Microsoft Windows NT Server 4.0 and Windows NT Server 4.0 Service Pack 4. This problem was first corrected in Windows NT Server 4.0 Service Pack 5.


Article ID: 219323 - Last Review: 11/02/2013 23:54:00 - Revision: 3.0

  • Microsoft Windows NT Server 4.0 Standard Edition
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