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You might want to review your organizational policies, and applical governmental regulations...
You might also find yourself in difficulty with other organizations who send private internet communications to people in your organization.
Clarifications:
1) In organizational/corporate environments, employees generally have NO expectation of privacy when using corporate equipment. (i.e. in general, employers have the right to listen to phone calls, email, web sites visited, etc) if you're using their phones, computers, etc.
2) It's a different story when one is using their own personal equipment
3) Tho,
regardless, in this thread for this case i think the law applies less and i'd guess Mom and Dad will be the governing body!
That said, i'll add:
4) Mflynn: Hmmmmmm.. Very sneaky!
Maybe a bit too much so! Especially if it means installing software on someone else's computer (kinda like the difference between going into your sibling's room and digging through their stuff vs. finding something in the hallway closet)
5)As for wireshark packet monitoring on a network,
Check you have recent versions of Wireshark and WinPcap. (Did you let wireshark also install WinPcap?) Under Edit->Preferences->Capture make sure your adapter is default and Promiscuous option is checked. You'll also find Promiscuous mode options under Capture->Options and Capture->Interfaces. Also i'm assuming you are running with a userid with admin rights?
When looking at data with Wireshardk, one can also have wireshark filter the display packets to only show http packets to/from the IP address of your choice (e.g. a specific computer on your LAN)