What free firewall does everyone use with avast free AV?

[Para-Noid]

Yes! Follow these instructions to letter http://www.knightwithapc.com/2011/11/download-comodo-firewall/

http://www.filehippo.com/download_comodo/13662/

Untick everything on the first screen>click "custom install">tick only the "firewall" box>click "back">click "install">reboot. 

The CFW GUI is extremely easy to navigate. I have all ports stealthed. 

[php111]

I was going to follow this guide except I don't use my computer for limited. I only use and have one account. http://forums.comodo.com/guides-cis/using-comodo-internet-security-as-an-antiexecutable-t60303.0.html

[Para-Noid]

I am the only one using my laptop and I feel very protected with avast and CFW w/D+.
To each their own. 

[Eddy]

Many people are not aware that they already may have a hardware firewall which is much better than a software one.
Check your modem/router manual to see if it has a firewall or not.
If it has, login to the modem/router and make adjustments to the settings (if needed/wanted)
If you have a hardware firewall, there is no need to have a software one as well.

As I have said several times before on this webboard:
See the firewall as a doorman.
Put him outside and in front of the door and he will not let unwanted people in. (hardware firewall)
Put him inside and the unwated people are already in before he sees them. (software firewall)

[midnight]

I used Windows Firewall and my Routers Firewall.

[DavidR]

Many people are not aware that they already may have a hardware firewall which is much better than a software one.
Check your modem/router manual to see if it has a firewall or not.
If it has, login to the modem/router and make adjustments to the settings (if needed/wanted)
If you have a hardware firewall, there is no need to have a software one as well.

As I have said several times before on this webboard:
See the firewall as a doorman.
Put him outside and in front of the door and he will not let unwanted people in. (hardware firewall)
Put him inside and the unwated people are already in before he sees them. (software firewall)

Most hardware firewalls only provide inbound protection not outbound. Connections originating from your system will be able to get back in to your system without a second glance from your firewall as the request originated from your system.

You only have to browse the viruses and worms forum to see that many are already in your house, they have already got past your firewall and AV. The first people know is when they try to get outbound connections to malicious sites and avast alerts.

So outbound protection is none the less important; to use your analogy, OK the thief has got in, but you want to catch him and not let him out to continue his criminal activity.