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Here is what I am trying to do. I have two different VLANs, each using their own Squid proxy-caches. Now I want to set up a single proxy-cache which both VLANs use. The catch is I don't want them to share the cache for security purposes. Is it possible to provide isolation in this way? I am willing to use some other proxy-cache which provides this.

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up vote 1 down vote accepted

You can run as many instances of Squid (or any proxy) on the one box as you're machines resources will allow. If you have 2 separate configs and cache_dir's for each they will remain functionally separate. Plumb each VLAN into the box and have squid1 listening on each VLAN1 and squid2 listening on VLAN2

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