title: Sniffing network traffic for signs of viruses/spyware
body: <p>How can I connect a system to a network and sniff for virus/spyware related traffic?  I'd like to plug in a network cable, fire up an appropriate tool sand have it scan the data for any signs of problems.  I don't expect this to find everything, and this is not to prevent initial infection but to help determine if there is anything trying to actively infect other system/causing network problems.</p>
  
  <p>Running a regular network sniffer and manually looking through the results is no good unless the traffic is really obvious,but I havn't been able to find any tool to scan a network data stream automatically.</p>