I upgraded my DSL service and recieved a new DSL Modem/Wireless router with the deal. I'm having some issues with my DSL router provided to me by my isp. For some reason port forwarding does not seem to work. The only way I can set up a server of any kind and have someone connect to it from the net is if I enable IP Passthrough on my DSL router, that basically opens up my PC directly to the internet.
I've always relied on my router's firewall to protect me, and have used a software firewall as a second layer of security. With IP Passthrough enabled, I'll have to rely solely on my software firewall. I'm currently using Zone Alarm 7 on the Windows side and just IP Tables on the Linux side (I have a dual-boot setup). How protected am I with this configuration?
I ran some tests on grc.com and passed, all ports stealthed, but I'm still not convinced it's enough. What's you're opinions on relying solely on a software firewall?