SCCM 2012 R2 Server Update Relay

I'm looking for a way to use SCCM 2012 R2 as a serve update relay for a few servers on our farm. I want them to have no internet access but they will still be able to reach out to the SCCM server. I do not want to push updates to these servers but rather be able to redirect the servers themselves to look at SCCM and pull whatever updates are available, thereby bypassing the internet and only using intranet to get updates. Is such a thing possible?

Thank you.
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Nagendra Pratap SinghDesktop Applications SpecialistCommented:
Yes. Just disable the default gateway on these machines.

Or just use the firewall and block the machines from Internet. SCCM can still patch the machines on Intranet.
Nagendra Pratap SinghDesktop Applications SpecialistCommented:
SCCM is a pull model. Not a push model.
gkhanagovAuthor Commented:
I understand how to block the internet, but my question is how do I point the WSUS to SCCM? And also is there a way to configure SCCM to allow this sort of proceedure?
i.e. I want to be able to open WSUS on the server and search for updates just like normal, but the updates if finds would be coming from SCCM rather than the web.

Nagendra Pratap SinghDesktop Applications SpecialistCommented:
Install Software Update Point in SCCM, this is a WSUS server installation controlled by SCCM. This will point it to that WSUS server and will update PC's local policy to point to this new WSUS server.

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