Background. I have a machine that has a controllogix processor with a 1756-ENBT for ethernet communications. I have an 8-port switch and the 9300-RADES ethernet router on the panel of which the processor can communicate to VFDs and HMI. I have given the ENBT module an address for our shops LAN and can access this processor via the LAN. The RADES unit has an IP one number from the ENBT unit. I am trying to use my computers modem to dial a seperate ISP (Netzero) so I can come back in to our network through our public IP NATed to the 9300-RADES IP address to access our machine. I have verified all ports that RSLinx requires are open but cannot gain access to the ENBT module and the processor. I can ping it and even gain access to the RADES unit with my browser. Any help is greatly appreciated as to how to make this work.

Remember that the 9300-RADES actually takes up *two* IP addresses; the one that it's configured for and host+1.

For example, if the RADES is 10.10.10.1, it will also use 10.10.10.2. If that second address is the address of your 1756-ENBT, you won't be able to communicate with the ENBT.

I do not know why this is the case, but it's in the installation instructions for the RADES and I've seen it myself.

Generally a NAT router is very hard to intentionally traverse in the *reverse* direction, even when you declare DMZ addresses or forward ports. I strongly prefer VPN appliances or point-to-point dialup connections, which is exactly what the RADES is meant to do.

The EtherNet/IP browsing driver will almost certainly not work backwards across a NAT router because it uses UDP multicast on Ports 2222 and 44818. Try the older "Ethernet devices" driver in RSLinx, in which you configure a station number/IP address table.

How do I setup or roll back to the old ethernet driver? I also at this point have my IT department setting up a VPN for me to test as I changed the RADES to a different address where the second address would not hinder me and it still did not work. Thanks for your help.