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    Please edit your question and add more details and clarification. How exactly do you send traffic? What means "not able to send it"? Does an error occur? Do the packets get sent directly from A to C without passing B? This would be the expected behavior if all interfaces are connected to the same logical network. Addresses 10.1.1.300 and 10.1.1.400 are invalid. What is your network mask? Routing tables? Showing the corresponding code would help to understand your question. Commented Dec 16, 2020 at 15:45
  • body says "A to C via B". Title says "from three different system in same" which is it? Commented Dec 16, 2020 at 16:12
  • If you can't ping B from A, then doing anything else in that direction between those two hosts seems to be out of the question. You seem to have an issue with your network setup that you will need to resolve before you can start thinking about sending data between your systems. Commented Dec 16, 2020 at 16:23
  • What virtualization software do you use? How did you configure the network for the VMs? Please add more details about what you want to implement. Do you want to configure the routing in a way that any packet sent from A to C or vice versa will be automatically routed via B? Or do you want to implement a software to be run on machine B that will communicate with both A and C and forward data from A to C and vice versa? Commented Dec 16, 2020 at 16:40
  • Inconsistency: Title says same network, body says "to interface eth0 of system B and send it of eth1". Commented Dec 16, 2020 at 17:21