GDENNIS%NTUVAX.BITNET@cunyvm.cuny.edu (06/18/91)
Hi there! I have a network of workstations (Sun, HP, DEC, IBM) and I would like to allow some of our clients to dial up via ISDN, and use SLIP to allow them to run Xwindow applications on PCs or workstations at their remote sites. I am inclined to use a Sun 3/60 running SunOS 4.1.1 to be my gateway to these remote sites. I expect the "topology" would look like this: Remote <-> SLIP <-> Modem <-> ISDN <-> Modem <-> Sun <-> Local ethernet PC Pkt Dvr line 3/60 (138.2.131.0) 1. What would be a good PC X-server for this setup? 2. What else would I need on the remote PC? I presume I can use something like KA9Q, NCSA Telnet, or FTP software's PC/TCP. I will probably need to use Clarkson's SLIP packet driver (I presume this is the SLIP8250 I see in the Ver 9 packet driver collection). Anything else? 3. What kind of serial port will the SLIP packet driver support? Asynchronous ports? Synchronous ports? I presume the SLIP driver is independent of the maximum data rate? 3. What dial-up software will I need? How does this dial-up software hand-off to PC/TCP once the connection has been made? 4. What would I need on the Sun (commercial or public domain)? Where would I get these from? 5. How must I assign the IP addresses for the remote PCs and the Sun's serial interface to the ISDN modem? I will need a separate subnet for the serial interface on the Sun. Must each client be assigned a different IP address on this "serial subnet" or can they all share the same IP address. 6. What are the security considerations when using SLIP? 7. My ISDN modem provides async serial service up to 19.2 kbps and sync service up to 64 kbps. However I only have async ports on my workstations. Is 19.2 kbps adequate for the remote PC to run an xterm to my workstation. 8. If this works out, and the demand justifies it, I would probably replace the Sun with a terminal server. What should I look for if I wanted to buy such a box? I guess 56 kbps interfaces should be one thing. Any others? 9. Anything else that I should consider? Thanks in advance for your help. ============================================================================= Dennis Sng Internet: gdennis%ntivax.bitnet@cunyvm.cuny.edu GINTIC Institute of CIM Bitnet: GDENNIS@NTIVAX Nanyang Technological University Fax: (65) 265-6377 Singapore 2263 Tel: (65) 660-5548
spero@hpindda.cup.hp.com (Spero Kouloures) (06/20/91)
A new product from Hewlett-Packard might interest you. It is an ISDN gateway which provides connectivity between ISDN equipped systems and TCP/IP LAN's. The gateway supports up to 6 BRI connections and can be used to connect individual ISDN equipped systems to a LAN. Two ISDN gateways in a back-back configuration can also provide connectivity between two seperate TCP/IP LAN's. The BRI lines can be combined to get 6 x 64kBPS throughput. Contact Dan Dutro at (408) 447-5133 for more information. Regarding running X over a 19.2 link, when I asked a similar question about two weeks ago the answer was - it works but is painful. A 64KBPS link would probably do the trick. Reagrds, Spero Koulouras Standard Disclaimer: Any comments or opinions expressed are my own and are not sponsored, supported or acknowledged by Hewlett-Packard.