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Connecting to a LAN with System 7.5.3

My roomates and i have a LAN in our house (so we can all access a cable modem).  I upgraded to system 8.0 and everything was fine, but my computer (a performa 6400, 180 mhz) ran real slow, so i downgraded back to system 7.5.3  When i try to ping our 'server', i get a message saying that it can't find macTCP in the system folder, or that it is installed wrong.  I checked, and MacTCP is definitely there.  I even deleted and then re-installed it.  What am i doing wrong?
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durban
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durban
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AureliusCommented:
MacTCP is based on the old 'classic networking', prior to Open Transport.  Open Transport (OT) apparently came with system 7.5.2 and later.  If OT is installed in your system it is possible to switch between 'classic networking' and OT using the provided utility called "Network Software Selector".  Try switching networking types and try again.  (note, certain ping utilities may not work with both networking types)

If OT is not on your system your best bet would be to install it and then test your networking from there.  The main advantages would be faster PPC networking, more reliability and more (and simpler) configuration options.
OT 1.1.2 is a 7.1mb download from:
<ftp://ftp.apple.com//Apple_Support_Area/Apple_Software_Updates/US/Macintosh/Networking-Communications/Open_Transport/OT_1.1.2-Net_Install.sea.bin

Follow the instructions for the installer, configure your necessary network options and try from there.

*note:
If you don't wish to use system 8.x your best alternative would be system 7.6.1, if you can get your hands on it.
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AureliusCommented:
sorry for using so much screen real estate.  long url could have been split..  :)
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