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RED configuration question

Hi, first time RED deployment 

Situation:

SG210 at main office. LAN is 192.168.20.0/24
RED 15

Plan is to deploy in Standard/Split mode so Internet traffic uses the branch office existing Internet.

Problem: The branch office is in one of those office suite buildings where the Internet access is provided to the suites. Individual suites are VLAN'd. In this case, the one and only PC in the branch office suite has been given (DHCP) the IP address on the office building's LAN: 10.100.0.128/16.

As a test, I tried to configure the RED at my house to connect the same way. I have a LAN using NAT at home, so I have a 192.168.1.x/24 address on my PC.

The RED connected no problem, but I cannot ping any devices on the 192.168.20.0 network at the main office. I then tried the other two modes and had different issues but in no case was I able to connect to the Internet and also connect to devices through the RED - regardless of the mode I was in.

So I don't want to send this thing to the branch until I fully understand what I'm doing wrong and can make it work. Can someone walk me through the steps to configure a Standard/Split Mode? Yes, I know there are both Sophos and 3rd party documents available but neither helped me.

Thanks



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