You have justified using an AntiVirus if you are going to use your Linux box as a proxy. As you might already know, Linux virus (and worms, etc) are not very common. Still it's good to use an AnitiVirus (in security you should be paranoid
) especially if your network contains Windows boxes.
Now to the point,
there are several antivirus products available for Linux both commercial and FOSS (Free & Open Source Software). Some commercial products have free trials. Some work as (mail, http, ftp) gateway scanners, some just as file system scanners. Some have real time monitoring, some don't.
Here are some popular free products. Please read more about their features before taking a decision.
My personel favourite FOSS antivirus system is Clam AntiVirus
. It has a good selection of third party
support tools. Several popular organization like SourceForge, DynDNS, No-IP, Roaring Penguin, Barracuda Networks, etc. uses this. You can see a list
of them. One thing is ClamAV does not support file repairing. Anyway, I/m quite impressed by the product.
The popular Panda Avtivrus is having a Linux version
for free. They hav disinfecton functionality also.
3.F-Prot Antivirus for Linux Workstations
is free for personel use.
4.AntiVir Workstation for Linux - PersonalEdition Classic
is also free for non-commercial use. New version includes a new GUI.
5. BitDefender Linux Edition
is also free.