At school we have a school-wide LAN network. It connects all the wireless devices to the internet. I've gotten the wireless pass code and have successfully connected to the network, yet I can't use the internet. I assume there is a list of whitelisted MAC addresses on the network that gives only whitelisted devices access. If that's the case, if I'm not whitelisted, can I still access other computers on the LAN?
The school network administrator could limit the access to Internet through the following ways (depending on the network devices):
- MAC Address filter (White/Black list) - Not very efficient though since a MAC address can be easily spoofed.
- Scheduled time - Only within a certain time frame the connection to the Internet is allowed
- URL Blocking (White/Black list) - Just some certain URLs can be accessed
- Second authentication - Which could be based on credentials such as your enrolment number and a password.
- NAC - Network access control limits the connectivity to a Network for example if you don't have a software agent installed to authenticate to a Radius server.
Can I still access other computers on the LAN?
It depends if the DHCP server granted you a valid network IP address. Check if via
ipconfig Windows or
ifconfig Linux. If the address starts with 169.254... it means you got a so called Link-local address and cannot interact with the other computers within the network.