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Windows Server



    

Group Policy and Slow Links    

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Group Policy and Slow Links



Apr
15

Group Policy and Slow Links

 

Group Policy does not apply when connecting remotely over a slow link

http://technet.microsoft.com/en-us/library/cc759191.aspx 

 

Group Policy slow link detection

http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/gp/35.mspx?mfr=true

 

Extra Links for further study:

Logon Optimization

http://msdn.microsoft.com/en-us/library/aa374350.aspx

 

Specifying Group Policy for Slow Link Detection

http://technet.microsoft.com/en-us/library/cc781031.aspx

 

 

 

When Group Policy detects a slow link, it sets a flag to indicate to client-side extensions that a policy setting is being applied across a slow link.

Individual client-side extensions can determine whether or not to apply a policy setting over the slow link

 

Once a Slow Link is detected following Policies will not apply

 

1. Scripts

2. Folder Redirection

3. Software Installation

But the catch is about the Slow Link

Now a common idea about a slow link would be the speed or the type of the Link (Dial Up, T2 Etc)

 

But actually the Slow link detection requires the Internet Control Message Protocol (ICMP)

 

For example, if a router allows for only ICMP ping packets that have a size of 1,024 bytes, the slow-link detection feature may flag the connection as a slow link. This is because the router discards ICMP packets that are larger than 1,024 bytes. If the router discards the packet because it exceeds the allowed size, fast links may be reported as slow links

 

So in other words even if the client computer can ping with packet size of 2048 and if a router allows for only ICMP ping packets that have a size of 1,024 bytes, then any packet larger than 1,024 will be rejected and will be considered as a Slow Link

 

So it’s not only the Packet Size that a client computer can Ping but also the Allowed Packet Size on the Router

 

 

To set a Low Packet Size on the Router, We can modify the Following Registry Key

 

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

 

Value name: PingBufferSize

Value type: DWORD (decimal)

Value range: 500 - 2048

Default Value: 2048

 

Related Articles:

 

Group Policy Processing

http://technet2.microsoft.com/WindowsServer/en/library/89d7ec5f-a909-4f61-aded-c5b69f5f730b1033.mspx?mfr=true

 

Group Policies may not apply because of network ICMP policies

http://support.microsoft.com/kb/816045

 

 

 

 

 

 

 



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