LittonPaul, This setup shouldn't be an issue as long as it's configured properly. The first thing I would look at is your DHCP configuation and verify that it's setup properly. Then I would make sure that you are actually being handed the public IP from the router that you are using, it could be that your actually getting it's internal IP range and you using the 192.168.1.1 range is causing a conflict with what your router is handing you. I also don't see where the guide has you putting in an access policy to allow traffic. Check your policies and see if you have anything other then the defaults; if not then you need to create a policy that allows traffic from your trust zone to your untrust zone, by default without any added policies this traffic would be denied.
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