After the installation clamav activates itself automatically, which can be verified under status -> Services.
ClamAV is now installed, so activate the “squidclamav” in the proxy settings. If “squidclamav” does not show up here, verifiy that you installed BOTH packages.
Important: ClamAV requires more filter processes (so change the processes to 20), which leads to a higher memory consumption. If your IPFire box has not that much memory (< 512MB), advise yourself.
If you see problems with stream-providers like Youtube, find some help to optimize your ClamAV here.
Update your virus signatures with the following command over the Console:
If you like to test the security of your ClamAV, try it without any danger here. These are only virus signatures - without any harmful content. (Please verify yourself)