The subject of configuring network cards, including the 3c509, has been the topic of many threads here. Try using the Forum Search
to see if the responses in past threads answer you question. Also try the forum search at linuxnewbie.org
. Use "3c509" as your search keyword.
If you don't find an answer, please include specifics regarding your system configuration, distro/version of Linux, troubleshooting steps you've already tried, and error messages you've encountered in your next post. By providing that information you'll help us pinpoint the problem more quickly.