adccommunitymod (AutomationDirect) asked a question.
Modbus TCP over Hughesnet
Created Date: July 17,2018
Created By: GNRick
**** This post has been imported from our legacy forum. Information in this post may be outdated and links contained in the post may no longer work.****
Hello all, new to the site. I'm trying to pass ModbusTCP (502) over hughes net, for my testing there are no filters, firewall, vpn etc. I can see that the traffic is passing through my Hughesnet router and getting to my ScadaPack with a network sniffer to the proper port and the ScadaPack is trying to reply back but I simply can't connect to it, it just doesn't work. Is there a special trick to get ModbusTCP to work over Hughesnet while using NAT (modem doesn't support bridge mode)
Created Date: July 17,2018
Created by: GNRick
Hello all, new to the site.
I'm trying to pass ModbusTCP (502) over hughes net, for my testing there are no filters, firewall, vpn etc. I can see that the traffic is passing through my Hughesnet router and getting to my ScadaPack with a network sniffer to the proper port and the ScadaPack is trying to reply back but I simply can't connect to it, it just doesn't work.
Is there a special trick to get ModbusTCP to work over Hughesnet while using NAT (modem doesn't support bridge mode)
Created Date: July 17,2018
Created by: ControlsGuy
Does the ScadaPack have a gateway address configured (LAN side of the router)?
Created Date: July 18,2018
Created by: MikeN
I doubt the issue has anything to do with who your internet provider is. More likely it is an issue how how one of the LANs and/or control systems are configured.
Are you using a VPN to create a secure tunnel between sites?
Created Date: July 21,2018
Created by: OkiePC
Is there a connection timeout value you can increase to allow for the satellite based internet to complete the transmissions? I had satellite internet a few years ago and the actual ping times were around 6000ms. The provider I used had some tricks they used which worked fairly well for fooling a regular browser into working a little better, but with a typical satellite being over 22,000 miles away, you either need to allow for delays or invent a machine to overcome the speed of light.
Created Date: August 07,2018
Created by: Brandon_
I'm with OkiePC. Having supported a few satellite internet installs, they can be a nightmare on latency. I'd bet dollars to donuts that it's timing out.