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I talked by phone with one of our new Cobia users today who wants to use Cobia as a transparent firewall. A transparent firewall is one which doesn't use NAT (network address translation) between internal IP addresses and outside networks, such as the Internet.

While this might sounds like a very easy proposition (and it is easy to do with Cobia), many consumer grade and SOHO firewalls ship with NAT enabled and no option to turn it off. That's a problem when you don't want to use NAT. (Maybe you could configure NAT on the device to NAT the address to the very same address, but that would be silly wouldn't it.)

To create a transparent firewall with Cobia, simply do not enable NAT in the Cobia Firewall module. Or create exceptions so that some device IPs are NAT'd while others pass through without translation. It's that simple.

Happy firewalling!

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