Method 2: Because the FreeBSD kernel has default drivers to support RTL8139C and RTL8169S. To use the RTL8139C+, RTL8169SB, RTL8169SC, RTL8168B, and RTL8101E, you need to update your NIC driver by recompiling your FreeBSD kernel.
The main steps you have to do:(FreeBSDSrcDir means the directory of FreeBSD source code and it may be "/usr/src/sys")
1. keep the orginal driver source code: # cd /usr/src/sys/pci # cp if_rl.c if_rl.c.org # cp if_rlreg.h if_rlreg.h.org
# cd /usr/src/sys/modules # cp Makefile Makefile.org
# cd /usr/src/sys/modules/rl # cp Makefile Makefile.org
# cd /usr/src/sys/i386/conf/ # cp GENERIC GENERIC.org
