I kust realized that some other PC is also getting assigned a IP address (DHCP Lease) from my modem. I am sure this is not one of the PCs in my home.
My modem was using WEP security. I know WEP is far less secure and WPA is better, but this actually is a borrowed modem, and I did not know that WEP was used.
I immediately did the following : On My Modem
- Changed the encryption mode from WEP to WPA
- Changed the password
After this I do not see the intruder PC on the DHCP list.
On my Mac:
- Changed the permissions on the public folder to "everyone - no access"
- Turned off "File Sharing" in System Preferences (But I would want to turn it back on sometime)
My mac is the one that is always on, Both the admin user and the user I normally use are password protected.
Is the above sufficient? Should I do something more?
Also, is WPA security sufficient? Should I take other steps?