How to Check Packets Between an IPv4 Server and a Client

1. Establish a snoop system off a hub (or a mirrored port on a switch) that is connected to either the client or the server.

   The third system (the snoop system) checks all of the intervening traffic, so that the snoop trace reflects what is actually happening on the wire.

2. Type the snoop command with the appropriate options and save the output to a file.
3. Inspect and interpret the output.

   Refer to RFC 1761, Snoop Version 2 Packet Capture File Format for details of the snoop capture file.