how can I spoof my identity to a router after changing my mac & IP, I know STP has to be manipulated but how?

Question

I want the routers on my LAN to masquadare my requests under the identity of another system on my network.
I used nmap to spot systems connected to my LAN and i changed my IP and MAC to theirs. The strange thing is that I am able to ping all hosts on my LAN but am not able to connect to the internet.
I beleive it's got something to do with STP. In cisco routers STP or the Spanning Tree Protocol is used to prevent loops in the network in effect prevent redundant addresses (thats my understanding of STP). I googled this problem and found many things around the solution but they dont fit together. For instance, I have figured a way to become the STP root on the lan by sending fake BPDUs but I am not able to relate this with my objective. Any help is greatly appreciated.

I want the routers on my LAN to masquadare my requests under the identity of another system on my network.
I used nmap to spot systems connected to my LAN and i changed my IP and MAC to theirs. The strange thing is that I am able to ping all hosts on my LAN but am not able to connect to the internet, but when i switch back to my original IP and MAC, I am able to access the internet with the very same settings (default gateway, DNS etc.) so, the connection settings are correct.

I beleive it's got something to do with STP. In cisco routers STP or the Spanning Tree Protocol is used to prevent loops in the network in effect prevent redundant addresses (thats my understanding of STP). I googled this problem and found many things around the solution but they dont fit together. For instance, I have figured a way to become the STP root on the lan by sending fake BPDUs but I am not able to relate this with my objective. Any help is greatly appreciated.

when i switch back to my original IP and MAC, I am able to access the internet with the very same settings (default gateway, DNS etc.) so, the connection settings are correct.

Answer 1

Check your gateway, you may be in your network, but have the wrong gateway, add secondary gateways or find the correct one.