Dan,
Thanks for the kudos. ?Found something even better. ?If you look at the repeater.config file, you will see there is an extra colon put in after the COM callout (COM1:0: for example) by the D-RATS software configuration screen. ?Remove the extra colon manually and TNCs will interface well with the repeater/ratflector software.
If you want to use a soundcard, you can use a package like AGWPE Express to forward a "virtual" COM port to the TCP/IP port on the AGWPE or UZ7HO soundcard modem software.
Hope that helps you even more, because it eliminates the TCP/IP intermediate layer!
Best Regards,
Jeff Scoville