Currently I have a ClearOS machine that serves as the gateway/dhcp/mail/samba/... server for a network. I wanted to install a separate firewall, and reconfigure the server so that it only used one NIC, and had all of the WAN-facing services forwarded to it through the new firewall. I thought it would be as easy as switching the server from "gateway mode" to "standalone server" mode, but after I did that I could no longer reach any of the public facing services like mail, ssh, and webconfig. I was able to interact with them from the local network, and I confirmed with some packet sniffing that all of the correct forwarding was being done by the new firewall. I tried reconfiguring the NIC as static "external", and I tried changing it to DHCP but that didn't help. Is there some specific reconfiguration that needs to be done when performing a conversion like this?
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Have you removed your newly spare NIC. If not, what you should have is the one NIC unused and, if configured, configured to be in a different subnet from your connected NIC. The connected NIC should be defined as external, and, while setting up, I'd suggest without a firewall. You can remove the unused NIC.
Is this how you are set up?
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