Can you smart folks explain some things about IP addresses for me?

[CloudWatcher]

7. Return address

Every packet of information flowing on the internet has both a source and destination IP address. Think of it like the two addresses on an envelope in normal postal mail (the return address and the destination address for the mail).

And, just like when using postal mail, you can lie and put whatever you want in the source (senders) address.

This usually isn't much good, since an internet connection normally requires communications in both directions. But there are a few odd corners of the protocols where fibbing about the packet's origin can help the bad guys screw things up.

I.e. don't lose sleep over it