Periodic Re-Transmit Times for Packets

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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

Article ID: 135360 - Last Review: 02/28/2014 07:58:11 - Revision: 3.1

Microsoft Windows NT Advanced Server 3.1, Microsoft Windows NT Workstation 3.1, Microsoft Windows NT Advanced Server 3.1, Microsoft Windows NT Workstation 3.5, Microsoft Windows NT Workstation 3.51, Microsoft Windows NT Server 3.5, Microsoft Windows NT Server 3.51

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