From: utzoo!decvax!cca!dpk@BRL@sri-unix Newsgroups: net.unix-wizards Title: Re: Very Distant Host support under 4.1bsd Unix. Article-I.D.: sri-unix.3191 Posted: Thu Sep 9 17:10:53 1982 Received: Fri Sep 10 06:34:20 1982 From: Doug KingstonDate: 8 Sep 82 4:44:12-EDT (Wed) I can't speak to the condition of the VDH (or HDH) code in 4.1, but even if it worked, you would not want to use it, the system load of doing all the VDH (HDH) protocol on top of TCP/IP is prohibitively expensive. A better solution to your problem of being distant from the IMP, is to buy a pair of ECU's (error correction units) which are manufactured by the same people who bring you the LHDH-11 ArpaNet Interface (ACC, Associated Computer Consultants). These wonderful boxes are designed to be placed between the IMP host port and your CPU interface. The ECU at the IMP end looks like a host, and the ECU at the HOST end looks like an IMP. In the you hook up the best phone line you can get (the one you would be running VDH on) and the ECU do the error correction in hardware to provide an error free link from HOST to IMP. The ECU can look like a DISTANT or LOCAL host on either end, and the ECU is good for all the bandwidth you can give it. Its also a lot cheaper than getting another IMP. Don't let VDH get you down, -Doug-