Does Airwall serial over IP support IEC-101?
IEC-101 is a fairly flat serial protocol, so it should work well with the Airwall Solution's serial-over-ip interface.
Please note, this interface simply encapsulates serial over a TCP connection. It does no processing, and does not respect framing. The software communicating with the IEC-101 devices needs to be able to reassemble the network frames.
As with any serial protocol and network software, test your exact combination to make sure it functions as expected.