Keith,

One thing you can do is setup your firewall to pull DHCP from cox. Then configure your Linux box (and Winblows) to use 192.168.0.1 (your firewall) as the DNS. This way, if Cox changes the DNS and/or IP address, your firewall will act as both DNS and Gateway. This simplifies the configuration and makes it more dynamic. Example:

Windows Static IP Configuration:

IP: 192.168.0.50
Gateway: 192.168.0.1
DNS: 192.168.0.1

Linux Static Configuration
/etc/network-scripts/ifcfg-eth0 file could have 192.168.0.51 as IP address
/etc/resolv.conf could use 192.168.0.1 as the DNS server
/etc/network could use GATEWAY=192.168.0.1

I believe this configuration would set you up to have your machines as static IP addresses while your firewall could act as the Gateway and DNS mediary for dynamic.

Of course, if you want your configuration to be truly dynamic, you would set your Linux and Windows box to pull DHCP from your firewall. 

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