J
We have two networks to connect for Modbus TCP using a router/firewall.
One is GE's PDH (192...) for the controllers to act as a slave.
The other is a Telvent RTU residing on our Energy Management network that has strict guidelines and multiple layers of approval before the slightest change can be made due to NERC. Changes in that gateway are almost out of the question.
So we NAT'd the GE's IP addresses to the Energy Management network so the RTU can send the requests to an IP on it's network. We had to add a default gateway in the GE controllers so they could respond and pings work.
However, the controllers do not seem to respond to the requests at all. Do the GE controllers have default Modbus TCP security so that they will only respond to an IP address that is on the GE network? I know the translation is normally done the other way for GE netorks (The RTU would be nat'd to the GE network)
For instance GE is a 192.201.x.x something but the requests are coming from 172.x.x.x something. Thanks... just wanting to rule that out.
One is GE's PDH (192...) for the controllers to act as a slave.
The other is a Telvent RTU residing on our Energy Management network that has strict guidelines and multiple layers of approval before the slightest change can be made due to NERC. Changes in that gateway are almost out of the question.
So we NAT'd the GE's IP addresses to the Energy Management network so the RTU can send the requests to an IP on it's network. We had to add a default gateway in the GE controllers so they could respond and pings work.
However, the controllers do not seem to respond to the requests at all. Do the GE controllers have default Modbus TCP security so that they will only respond to an IP address that is on the GE network? I know the translation is normally done the other way for GE netorks (The RTU would be nat'd to the GE network)
For instance GE is a 192.201.x.x something but the requests are coming from 172.x.x.x something. Thanks... just wanting to rule that out.