I think I have an intruder in my network. My home network is a mix of wireless and Ethernet connections. Two laptops are connecting wirelessly on Linksys router and two desktop are wired to router. Accidentally, I have noticed fifth computer (IP address) in DHCP clients table in router configuration web utility. What should I do?
It is very possible that you have an intruder in your network if you have not secured wireless network. You should enable WAP encryption and use some strong password. Also, enter MAC addresses of your network cards in MAC filter list and allow only these computers to access your router. If wireless network is not secured then this can be accidental intrusion, also.