Intercepting Communication: src and dst checks

[f4-u57]

The packet levels are missing source and destination checks for MAC and IP addresses.

For example, in the first TCP level, there is no check for the dst IP, but the TCP handshake level does.

I think having random src or dst that work does not make sense in the context of networking.

Note that this module is currently active for 365.

[ConnorNelson]

I assume you tested this?
Also, normally properties aren't verbs (check). I would just add something like user_host = self.network.hosts[0] or something to the beginning of the methods.

Did this effect student solutions in some way you noticed?

[f4-u57]

Yes, I have tested it with my solution and made sure it actually checks the right things.

From what I noticed, this will affect students who are either not setting src/dst or just something random and also can causes misunderstanding of "blah src/dst worked last level but not this one" or wrong "src/dst don't matter" assumption.