it really depends on the load received by the various physical and virtual...

it really depends on the load received by the various physical and virtual installations on that server. In general with only 5 other systems on the network I double that the load for any service is that high were you would have performance issues on the server.

However, in general I recommend keeping a proxy server on it's own hardware because a failure on the host or client OS of the proxy server disables internet access for all users. That is a very noticeable service to the users so you should take special steps maximize the uptime.

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