I have a bridged unchannelized DS3 running to a separate facility out of state. I'm running IRB on both edge routers to bridge the connection. Whenever we do a file transfer it seems to be taking much longer that what you would expect for a DS3. Right now there is no traffic on it and it takes 10 min. to transfer 1GB of data. I started looking into common problems experienced by high-bandwidth high-delay type networks. Theoretically increasing my TCP window size and turning on window scaling on my test boxes should have increased file transfer speeds, but it did not seem to help at all even though I can see the increased window in an Ethereal dump. Anyone have any ideas?