Hey guys, whenever I run Wireshark doing a packet capture, I seem to only get packets directed towards my laptop (the computer I'm running it on). It's strange because my brother is on my desktop next to me, playing video games, actively using the network, but I don't seem to be getting any packets directed to or coming from his computer.

My question is, is there some command or button in Wireshark that I'm missing that allows a network wide scan? Any input would be greatly appreciated.