In order to use the 192.168.3.x scheme on both interfaces you you are going to have to break it into two seperate networks, and the IP addresses you have listed above will not work. The WAN and the Internal interfaces can not be on the same network. Some other things we need to know to help you Is your ATT router handling logon (PPPoE?) or is it bridged? Is your Router on the other side of the Sophos being used as a router or acting as an access point? "Rule Type: SNAT (source)", " For traffic from: Internal (Network)", " Using service: Any", Going to: Any IPv4", " Change the source to: WAN (Address)". I prefer to setup a SNAT rule, under the NAT tab, instead. The other issue I have with the instructions in your posted link, is using the masquerading rule for NAT. You can tweek these later if needed but for most home users, the rules the wizard sets up will be all you need. The wizard will get you 80% there and will get your basic firewall rules setup. I have posted a link to the Sophos manual below to use as a reference, but at this point you should start over and this time use the wizard. But for now this is not causing your problem, using this firewall rule is ok for troubleshooting, but should not be left active. First, it is telling you to use the the firewall rule "Internal>Any>Any". Please do not use that guide you posted a link to, it is rubbish, and you will not have a firewall when you are done.
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