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Dialin Updates
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Dialin-4: A New Communications Server
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There soon will be a fourth dialin telephone server to handle calls to
campus machines and to the Internet. Dialin-4 will be identical to Dialin-3,
with 32 lines on a rotary, baud rates of up to 14,400 bps, and data compression
and error checking. To attach to the first available line, call (312) 413-9111.
Like our other dialin servers, Dialin-4 will support TELNET, TN3270, SLIP,
and PPP.
Most importantly, Dialin-4 will provide full Internet access to authorized
users, just like Dialin-3 does now. This is crucial for using Mosaic or
other Internet services from home.
Getting authorized is easy -- all you need is an account on tigger,
icarus, or UICVM. You won't actually log onto one of these machines during
this process, but when you dial in, our TACACS service will prompt you
for your account logon and password, and then verify the information. We
will turn on the Dialin-4 server as soon as the equipment arrives and the
phone lines are installed.
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Upgrades to Dialin-1 and Dialin-2
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As you might imagine, full Internet access is quite popular, so we will
upgrade Dialin-2 and Dialin-1 to provide it as well. Dialin-2 is scheduled
to be upgraded on July 1, 1995, and Dialin-1 will follow sometime later
this summer. At that time, all servers will be functionally the same, and
you'll have access to all services on the first open line of any dialin
terminal server. Everyone using the dialin service will have to authenticate
themselves, and will then be granted full Internet access.
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Dialing In from Rockford and Peoria
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There are terminal servers at Rockford and Peoria that match the local
UIC servers. (They serve the UIC College of Medicine at Rockford and the
UIC College of Medicine at Peoria; people at the UIC College of Medicine
at Urbana-Champaign get their network and dialin connections from UIUC.)
The UIC SLIP package will work without modifications on all ADN Dialin
servers, including those at Rockford and Peoria; only the phone number
changes.
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Now's the Time to Upgrade Your SLIP
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If you are running an old version of the UIC SLIP package, be aware that it won't
work with the TACACS service on the lines that provide full Internet access. The
current UIC SLIP II package is available (as is the entire NSKit) via anonymous
FTP from ftp.uic.edu, or, if you'd prefer, you can purchase it on diskette
at the Client Services Office (Room 2267 SEL) for a nominal fee. For additional
information, contact the CSO at 413-0003 or send electronic mail to consult@uic.edu.
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Slip Tips
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Using SLIP (Serial Line IP) offers many benefits over using Kermit. SLIP
allows your PC to function as if it were directly connected to the UIC
campus network and the Internet. All of the tools in the NSKit are available
through SLIP -- TELNET, FTP, Netscape, the Netnews/Usenet newsreader, and
so on. Installing SLIP and the NSKit is quite simple: a single command
loads the package and steps you through the configuration. That's the good
news. The bad news is there are a few things to watch for to make SLIP
work on your PC; SLIP is less forgiving than Kermit.
Most problems associated with SLIP can be traced to one or more of the
following:
- Your PC has an 8250 or 16550 uart rather than a newer and faster 16550A
uart. (A uart is the chip inside your PC's serial port that transfers the
data to and from the PC's bus to the serial interface.) SLIP will not work
reliably with an 8250 or 16550 uart. The SLIP installation program will warn
you of this, so beware.
Are you so afflicted? You'll need to buy a new serial card with a fast uart.
The CSO can recommend a vendor; the price is around $50.
- Your modem is not set for "hardware flow control". Hardware flow control
is required for SLIP. Check your modem manual for the correct switch setting
or "AT command string". Xon/Xoff flow control will not work with SLIP.
- Your PC's external modem-to-PC cable may not have all the wires needed
for hardware flow control. Cheap cables often only carry transmit and receive.
The correct cable uses pins 2, 3, 4, 5, 6, 7, 8, and 20. More pins are OK,
but if any of the these aren't wired through, it won't work.
- Your internal modem may not be fully compatible with your PC's data bus
and/or timing; some 8-bit internal modems won't work in faster machines.
If you haven't yet tried SLIP yet, or you have and it didn't work the first
time, don't be discouraged. Try these tips. It really does work!
Comments are appreciated; send them to
Cliff Nelson, cnelson@uic.edu |
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