Is Someone Using My Network?

i have airport extreme , wonder how else been leaching off network?

i'm looking @ dhcp clients (not sure means...) noticed mac address of sibling's macbook client id repeated twice 1 having no name , name "firstlastad3d". being spoofed? has two different ip addresses. secondly, computer not @ house either @ adjacent house.

use wpa2 security strong password , mac filtering small list of allowed devices. wireless network secure or vulnerable?

thank you!

 

if using wpa2 strong password , have update airport's firmware latest - don't think have worry about. unless sibling knows wpa2 password there no way he/she going able on network.

if still in doubt - generate highly secure password , use instead of current one, reboot router , safe

 

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