### Troubleshooting Tips

Use these guidelines if you have problems with the installation of a Linux driver:

- Verify whether you are running SMP kernels in an SMP system. In systems 2.2.x and later you can enter the command uname -a and locate the SMP flag in the kernel id.
- If you have unresolved symbol errors, the following procedure should recompile the headers provided the headers are kept in a standard location.

1. Issue the following commands:

   `cd /usr/src/linux
   cp .config config.keep`

   (The last command saves a copy of your current configuration as the file config.keep)

   `make distclean
   make old config
   make menuconfig`

2. Select processor type and features
3. Confirm SMP is on for SMP kernel or off for a non-SMP kernel.
4. Save settings
5. Enter the following command:

   `make dep`

- A loopback diagnostic test is part of the Digi Port Authority (DPA) program and can be run against any selected channel by pressing the T (or t) key from the channel monitoring screen. A loop back plug must be installed in the port to be tested.
- For further help consult the FAQ in the troubleshooting section of the Digi support site at http://support.digi.com