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Periodic Re-Transmit Times for Packets
Article ID: 135360 - View products that this article applies to.
This article was previously published under Q135360
Some network traffic occurs simply because the network is active. For example, some network traffic occurs as a result of periodic retransmission of packets as "keepalive" requests, browser requests, polling, and the acknowledgment packets sent for each of these requests.
The following table documents packet types and their default send intervals.
Packet Type Protocol Transport Interval ----------- -------- --------- -------- NetLogon SMB TCP/IP & NetBEUI 300 seconds Browse SMB TCP/IP & NetBEUI 300 seconds (Windows NT 3.1) 720 seconds (Windows NT 3.5x) KeepAlive NetBIOS TCP/IP 60 minutes (Windows NT 3.5x) SessionAlive NetBIOS NetBEUI 30 seconds (LAN Manager) Poll/Final LLC NetBEUI 30 seconds (or ACK to Poll) KeepAlive NetBIOS IPX 30 seconds Echo SMB SMB Direct Host IPX 240 seconds
NOTE: The Browse packet type mentioned above indicates network traffic between a Windows NT primary domain controller (PDC) and its backup domain controllers (BDCs).
The Windows NT redirector echoes an SMB every 30 seconds to each server that has an associated Long Term Request outstanding.
Some of the default values can be adjusted by changing the appropriate values in the Windows NT registry. For more information about these settings, query on the following words in the Microsoft Knowledge Base:
winnt registry keepalive | session timeout
For additional information on adjusting PDC browse broadcasts, please see the following article in the Microsoft Knowledge Base:
TITLE : Browsing & Other Traffic Incur High Costs over ISDN Routers
Article ID: 135360 - Last Review: November 1, 2006 - Revision: 3.1