Encrypt LAN and wifi traffic on small private network

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http://serverfault.com – I need some advice about encrypt all traffic on a small private network running wi-fi and LAN traffic on 192.168.0.x network. The network would comprise of client laptops connecting to the wi-fi router ( via ethernet connection or wireless. The main purpose of the server is for the client laptops to talk to two servers on different IP's ( and on ports 80 and 433. My main concern is having packet sniffers and what not getting access to the data. The only ways I see at the moment is to have VPN running on the network or use IPSec policy's to do this. (HowTos)