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WDS traverse vlans settings needed

We have a WDS server sitting on what we'll call subnet A.  the hosts we want to distribute images to are on subnet B.  the DHCP server also sits on Subnet B--the WDS server is NOT a DCHP server.  Question:

We want our WDS server on subnet A to allow us to pxe boot and connect to it from subnet B where most of our servers, workstations, and the DHCP server reside.  I've seen some information out there that states we need some special DHCP settings for this.  I've seen other information that we need to make some changes to our switches with IP helper entries.  Which is it?  What is required to allow us to PXE boot and connet to our WDS server in this scenario?  If it's only IP Helper commands, then I assume they would be needed for any subnet we want to direct to the WDS server subnet?  Thanks!!
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Craig Beck
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You need an IP Helper configured on the VLAN where the clients connect, pointing to the WDS server.

You will also need to configure some options on your DHCP server to tell the clients which server they need to connect to, and what image to boot from once they have PXE booted.

Have a look at this...

http://www.microsoft.com/download/en/details.aspx?DisplayLang=en&id=9709
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vivigatt
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Read my article.

You are right, if dhcp server and clients are on the same subnet, no need for an IP helper for redirecting broadcasts to the dhcp server. However, a PXE service listens to dhcp broadcasts too. Check the specs... its also states that udp 4011 is to be used only if dhcp and pxe services run on the same host. Using dhcp options 67 and 67 make it useless to have a real pxe service. You would then just need a dhcp and tfto server.  
Onve again, read my article, it tries to explain all this. You may want to know where I got that knowledge. Well, I was the architect if a software that allowed to remote boot windows using pxe (and some other stuff)...