You can download the source code for the latest version of SLiRP from the SLiRP Homepage There are several sites from which you can download SLiRP listed on the page. You can either download the source
code for SLiRP or you can download one of the pre-compiled binaries, which is a good idea if you are not familiar with compiling programs on a UNIX machine. Precompiled binaries can be found on www.ibc.wust
l.edu in the USE_AT_YOUR_OWN_RISK directory. ISIS runs IBM AIX, so get the file with the name like slirp.10b.aix41.tar.Z (version 1.0b was the most recent version of the program as of the time of writing. To use Lynx to download SLiRP
, highlight the AIX binary, and hit "D" to download. Go out to the command prompt and uncompress the file with command ("#" is your command prompt):
# uncompress slirp.10b.aix41.tar.Z
Then untar it with the command:
# tar -xvf slirp.10b.aix41.tar
This will create a directory hirerarchy called slirp in your home directory. The SLiRP binary can be found in the slirp/bin directory.
4. Great! Now I have SLiRP installed on my ISIS account. What do I need to do to run it properly?
In order to use SLiRP properly, you will have to log into ISIS and enter a sequence of commands to set up the dialup port to
pass-through TCP/IP frames, which often contain 8-bit data, without editing or bit-stripping.
- Dial into the UNC Broadband as you normally would.
- NOTE: If you are dialing in with a terminal program, make sure the modem configuration string does not contain a command to hang
up when the TR line drops. Check your modem's manual on the exact command to do this and make any necessary changes to the modem configuration
string in your terminal software package.
- Select option 18 (expert mode) from the dialup menu and press ENTER. You should then see the "OIT INET>" prompt.
- Enter the following command sequence at the "OIT INET>" prompt:
set port local %
- Log into your ISIS account as usual and go to a shell command prompt with menu option 6 on the ISIS menu (assuming you have not already disabled the !@%@%$@ menu!).
At the shell command prompt, invoke your SLIP/CSLIP emulator by cding into the slirp/bin directory and entering
- If all goes well, you should see your emulator's startup message and an instruction to start your SLIP software. When you see this
message, press the "%" key, and you should return to the "OIT INET>" prompt. When you are back at this prompt, enter the following
set session passall
- You should now see a message that you are now reconnected to ISIS. At this point you can start your SLIP software on your
4. What parameters should I use when configuring my TCP/IP stack to use with SLiRP?
As far as your IP address, you can use just about any IP address you want with SLiRP since
the emulator uses ISIS's IP address when it sends TCP/IP frames out onto the Internet. SLiRP recommends
that you use an address from the 10.0.2.x block, since 10.x.x.x addresses are reserved for private internets.
As far as the other stack parameters, conventional wisdom says that smaller is generally better for
serial links such as PPP connections. Here are some "optimum" parameters for Trumpet Winsock and a 14.4/28.8 kbaud modem someone posted awhile back:
I have gotten away with using the following parameters on my own PPP link:
Also, SLiRP supports SLIP and CSLIP, which are older protocols which perform the same function as PPP. PPP is now the standard, so I suggest you stick with it.
IP address of one of the nameservers at UNC is 220.127.116.11 (hermes.oit.unc.edu). Enter that IP address
into the Nameserver field in your TCP/IP stack.
J. William Snyder, Jr. ())
Last modified: May 20, 2005
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