type in ifconfig at the command line and you will see something like this:

abc@abc:~$ ifconfig -a
eth0 Link encap:Ethernet HWaddr **:**:**:**:a7:e3
inet addr:192.168.1.105 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::230:1bff:febd:a7e3/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:166784 errors:0 dropped:0 overruns:0 frame:0
TX packets:150063 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:122770772 (122.7 MB) TX bytes:23953862 (23.9 MB)
Interrupt:18

Look at your HWaddr address.
Mine is masked here but you will see all of yours.
You can log into your router to verify that your mac is connected either
wired or wirelessly.