Archive for the ‘Deployment’ Category

WDS Multicast is really slow!

When using WDS to load images, direct SMB unicast works fine but overloads the network and/or server if you have too many sessions. So we try Multicast and that goes incredibly slow! What is going on? There is all sort of info on how to “tune” multicast, but the most likely culprit is your network switches, especially if you have HP procurve switches. There are two things to do. 1) make sure IGMP snooping is turned on for the VLAN you are using. Do this by getting into config mode and issuing the following vlan 1 ip igmp (if you want to enable it on VLAN 1). 2) Change the default mulitcast IP range in WDS from 239.0.0.1 - 239.0.0.254 to 239.0.1.1 - 239.0.1.254 because apparently the default range is ignored by IGMP on ProCurve switches. Nice!

Speeds should be back up to blazing after this.

ds

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Redirect new computers from default container in active directory

This is posted lots of other places but this is easier to find:

Run the Redircmp.exe file at a command prompt by using the following syntax, where container-dn is the distinguished name of the organizational unit that will become the default location for newly created computer objects that are created by down-level APIs:
redircmp container-dn container-dn
Redircmp.exe is installed in the %Systemroot%\System32 folder on Windows Server 2003-based or newer computers. For example, to change the default location for a computer that is created with earlier-version APIs such as Net User to the OU=mycomputers container in the CONTOSO.COM domain, use the following syntax:
C:\windows\system32>redircmp ou=mycomputers,DC=contoso,dc=com

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PXE deployment doesn’t find WDS server

You’ve had your WDS server working for a while now, but suddenly it appears to stop responding to PXE boot requests. There are no error messages anywhere. WTF? What likely has happened is that the WDS server is running on a server that also has DNS running on it and the WDS and DNS services have overlapped ports with DNS overriding WDS. To fix this on a 2008 R2 server do the following: Set the UdpPortPolicy value in HKLM\System\CurrentControlSet\Services\WDSServer\Parameters to 0.

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