Depending on what your network admin is like if they see you using a proxy, they think you have somthing to hide!
We used to have software at work which monitored each IP and could see how much time spent where so clearing your history will not work, but gaining access early on a morning to the server and deleting your ip history from the file does hehe!!!
Network Packet sniffing is fun if you want to get sacked, you can if you know what your doing get passwords and logons
