someone using my wireless network??

[spinna]

ive just got a wireless router but ive just been thinking .......
how can i tell if some one is using it? say a next door neighbor or something?
the light one the router as flashing , but they have been flashing since i first installed it.
ive got passwords / security set as well

 

[spinna]

found this =

Connection Type: Automatic Configuration - DHCP
IP Address:
Subnet Mask:
Default Gateway:
DNS1:
DNS2:
DNS3:


what does this mean?

 

[spinna]

sorry for a stupid question , but how do i get that? im using a linksys router