title: Packet analyzers: how do they work?
body: <p>I've been quite interested in IT security for a long time and I've come across network snfifers several time. What I don't understand is how the process actually works. Let's assume we have a wireless network. Computer A requests an external website, going through the router. Computer B, which has the sniffer, captures the packages going through the local network. If that's the basic process, how can it capture a packet?
  Do you have to setup a fake router and sniff all traffic passing through, or can you just connect to a wireless network and start sniffing?</p>
  
  <p>If you feel like explaining the process in detail, or link to a guide, that'd be great.</p>
  
  <p>Thank you!</p>