Earlier quoted context omitted.
> IPv6 is already being deployed from top tier mobile carriers and that allows globally rout-able addresses even behind NATs. You're making a lot of assumptions: 1) That IPv6 will assign a unique and constant IP to every device. Many ISPs provide this as an up-sell feature, not the default, and I don't expect them to change their behavior even if the cost of it approaches 0. 2) That IPv6 will solve all your network p…
1) Each client checks for internal and external IPs and saves them. That list is transmitted to your friends every time you update them with other data. It automatically manages this list of possible places to reach you. 2) There will be indexers for these cases which can be used as relay points. C would merely be a match-maker, telling each host which IP address and port is currently open. No data is sent through C.…
>1) Each client checks for internal and external IPs and saves them. That list is transmitted to your friends every time you update them with other data. It automatically manages this list of possible places to reach you.
According to the link, "supernodes" route connections and provide matchmaking between Skype callers. How do you find the "supernodes"? "If this file is not present, SC tries to establish a TCP connection with each of the seven Skype maintained default SNs IP address on port 33033."
>2) There will be indexers for these cases which can be used as relay points. C would merely be a match-maker, telling each host which IP address and port is currently open. No data is sent through C.
"If caller and receiver are behind a UDP-restricted firewall they will need a relay (node) in between to establish TCP connection to and then the traffic (including media) will go through from one side to the other."
Skype's protocol would use host C as an intermediary.