skype establishes several connections on several ports. it doesn't limit itself to the port it is configured to run on in the settings. it uses 443 and 80 even when configured not to. several of the ip's are suspicious because they dont return pings while i have an established connection to them and they are most often from places like singapore. also there is virtually no mention of especially this singapore connection on the internet when i search on google. its almost like the ip range and port used are both phantoms because of skypes nature to use randomized ports in the range of 43xxx even when it is configured to use only one port. i call bull **bleep**. im starting to wonder if skype is functioning as a trojan.
01-06-2012 10:23 - edited 01-06-2012 10:33
the port configured in options is only for INCOMING connections and is chosen randomly when Skype is installed (you can change it to just about anything you like over port 1024), and likelwise ports 80 and 443 can optionally be allowed for INCOMING connections -- this is clearly indicated on that option page
outgoing connections are another matter entirely different matter -- you cannot constrain outgoing connections to certains ports or ranges of ports, because this depends on what is configured for other peers
it's also commonplace for nodes to not respond to pings -- it's typically a simple router setting (nothing to do with Skype)
if you think you're going to figure out how the P2P network works in detail, good luck to you, but you can learn a lot by reading things like this:
I just downloaded a net monitoring program called TCP eye, which shows active net connections on your PC. To my surprise one of them was an established connection for Skype, but it listed at being from singapore...why is there an established connection through Skype on my PC to singapore when Skype is just idling and not even being actively used?!?