# ifconfig
eth1 Link encap:Ethernet HWaddr 00:1e:8c:10:xx:xx
# arp
Address HWtype HWaddress Flags Mask Iface
192.xxx.x.x ether 38:72:c0:cc:xx:xx C ethx
How come it shows different MAC addresses?
EDIT: btw, the one shown by ifconfig
is the right one because it is the one that I see on my router