Proxy firewall Antivirus

A friend of mine is having an issue with computers on his network
receiving viruses, and the users disabling the anti virus. This is a
home network of about 4 machines, and we have been planning on setting
up a linux firewall to better secure the network before it hits the
router anyway. What I am wondering about is if anyone knows of a free
linux antivirus that will scan incomming (and preferably outgoing)
network traffic for viruses. I know the easiest solution is putting an
antivirus on each machine, but they quickly get turned off or deleted.
If anyone has an option in mind I would appreciate it.

Thanks
RS

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