Is it possible to configure Ubuntu as a software firewall?

Posted by user3215 on Ask Ubuntu See other posts from Ask Ubuntu or by user3215
Published on 2010-10-14T07:07:28Z Indexed on 2011/02/22 7:33 UTC
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security

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software

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firewall

I have some systems running on Ubuntu in the private IP range 192.168.2.0-255 . These systems are connected to a switch and the switch is connected to the ISP's modem.

Neither the switch nor the modem support firewall options. I don't have any firewall device and I'm not willing to individually configure firewalls on all the systems (via gui/iptables).

Is it possible to make an Ubuntu system into something like a software firewall, so that all the traffic/packets sent to or from the WAN(internet) would be allowed/denied based on its firewall rules?

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