yup.. each subnet would need to be isolated except for the proxy.. in terms of clients on each sub.. a max of 3 at any one time and once in place they will remain static.. i would propose to put them on the same ethernet segment unless this is not such a good idea..Then the easiest solution is to set up three aliases on the proxies ethernet card e.g.
ifconfig eth0 192.168.1.252 netmask 255.255.255.0 ifconfig eth0:0 192.168.2.252 netmask 255.255.255.0 ifconfig eth0:1 192.168.3.252 netmask 255.255.255.0
Remember you'll need to overhaul your squid acls to allow all the clients access. What is it that you're trying to acheive by splitting up the client base?
Colin
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