BSD & Linux
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1. All set!


Windows 2000
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Install the CIPE-Win32 VPN Adapter:

1. download from http://cipe-win32.sourceforge.net/ and unzip
   somewhere (e.g. C:\temp\CIPE-Win32)

2. go to Start -> Settings -> Control Panel

3. open "Add/Remove Hardware", click Next

4. select "Add/Troubleshoot a device", click Next

5. wait for search of new hardware to finish, 
   select "Add a new device" from list, click Next

6. select "No, I want to select the hardware from a list", click Next

7. select "Network Adapters" from list, click Next

8. click "Have Disk...", browse to the unzipped CIPE-Win32 disk1
   directory from above (e.g. C:\temp\CIPE-Win32\disk1), click Ok

9. "CIPE VPN Adapter" should appear, click Next, Next, Yes, Finish


Solaris
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Install the Universal TUN/TAP driver:

1. download the package for Solaris x86 from http://vtun.sourceforge.net/
   or for Solaris sparc64 from http://www.monkey.org/~dugsong/fragroute/
   and gunzip somewhere (e.g. /tmp/tun-1.1-sol80.sparc64)

2. as root, install package (e.g. pkgadd -d /tmp/tun-1.1-sol80.sparc64)