The procedure to activate DFE-538TX on Red Hat 6.X linux is as follows:

  step 1: copy the driver rtl8139.c from driver diskette to you linux.


  step 2: compile:
          The instruction for compiling the driver is include at the end of
          the driver file. (run this instruction at /usr/src/linux)
		  Or you can use the Makefile included in the driver diskette \Linux.

  step 3: insert the driver as module:
           insmod rtl8139.o
          (run 'lsmod' to see if the module is inserted)

  step 4: bind your card to an IP address

          /sbin/ifconfig eth0 ${IPADDR} broadcast ${BROADCAST}
          netmask ${NETMASK}
          (run 'netstat -i' to see if there is a interface 'eth0')

  step 5: add your card to IP routing table, then add gateway also your 
card:
          /sbin/route add -net ${NETWORK} netmask ${NETMASK} eth0
           (should be able to ping local network now)
          gateway:
          /sbin/route add default gw ${GATEWAY} netmask 0.0.0.0 metric 1

  step 6: start inet deamon.
          /usr/sbin/inetd
          (you are on the network now)

  *make sure that your kernel is built with network, fast_ethernet and 
module
   support. Otherwise, you have to rebuild your kernel.
        (1:go to /usr/src/linux directory
         2:run 'make menuconfig' or 'make config'
         3:mark the options list above.
         4:exit and rebuild your kernel.
            make dep;make clean;make zImage
           the file 'zImage' will be at /usr/src/linux/arch/i386/boot/zImage
         5:modify /etc/lilo.conf.(this file specify where kernel image is)
         6:run 'lilo'  )

  You can run 'netconfig' which will do step 4,5,6 for you.
  Then just add a line at the beginning of '/etc/rc.d/init.d/network'.
        'insmod /your driver path/rtl8139.o'

  then your driver will work every time you boot.