I do not see the network card

Hello I have a Mac with Snow Leopard 10.6.8 I installed version Version 1.8.5 (SVN Rev 47350 from /trunk-1.8) with Wireskark and X11 but when I check the network sceda I do not see ip mac has a network address fixed 192.168.1.20 someone knows help me before it worked because I already used now do not understand why I do not see the network card mac is connected via network cable to the router Thank you