This article was previously published under Q135360
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Some network traffic occurs simply because the network is active. Forexample, some network traffic occurs as a result of periodicretransmission 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 sendintervals.
Packet Type Protocol Transport Interval----------- -------- --------- --------NetLogon SMB TCP/IP & NetBEUI 300 secondsBrowse 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 secondsEcho SMB SMB Direct Host IPX 240 seconds
NOTE: The Browse packet type mentioned above indicates network trafficbetween a Windows NT primary domain controller (PDC) and its backup domaincontrollers (BDCs).
The Windows NT redirector echoes an SMB every 30 seconds to each serverthat has an associated Long Term Request outstanding.
Some of the default values can be adjusted by changing the appropriatevalues in the Windows NT registry. For more information about thesesettings, query on the following words in the Microsoft Knowledge Base:
winnt registry keepalive | session timeout
For additional information on adjusting PDC browse broadcasts, pleasesee the following article in the Microsoft Knowledge Base:
ARTICLE-ID: 134985 TITLE : Browsing & Other Traffic Incur High Costs over ISDN Routers
3.10 prodnt polling pulse background bdc keep alvie time out