If I type in anything and press RETURN, the server responds with: High bandwidth servers thatĢ20- contain the public release files are available at Ģ20- If you need to link to a public release, please link to the release server,Ģ20- Attempts to download high traffic release files from this server will get a So, I’m going to try to futz around with the Mozilla public FTP server, and show you what I get.įirst, I’ll connect to the FTP server with Telnet, like telnet 21Ģ20- / - files are in /pub/Ģ20- Notice: This server is the only place to obtain nightly builds and needs toĢ20- remain available to developers and testers. Traditionally, FTP servers run on port 21 – but really you could put one on whichever port you feel like. Skype is going to be quite a bit harder.Īnyhow, here is what I’ve found out about FTP… FTPįTP runs over a TCP connection, so if you’ve got Telnet, then you’ve got a basic FTP client. If it matches, chances are we’ve determined what kind of server is behind that IP/Port.įTP and HTTP are the trivial ones. If we get a response, we analyze the response to see if it matches what we expect from the signature. The big idea: we want to create some signatures, and then “replay” those signatures against some arbitrary IP and port. I’m taking a Computer Networks course this semester, and for my final project, my partner and I are trying to create signatures for FTP, HTTP, and Skype packets.
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