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From the top of my head, look at: 1. Fog Creek's Co-pilot: Joel wrote about something similar 2. Skype: How skype connects calls even in the presence of firew
by prakash 19y ago
From the top of my head, look at:
1. Fog Creek's Co-pilot: Joel wrote about something similar
2. Skype: How skype connects calls even in the presence of firewalls
- marcus 19y agoSkype uses tcp-ip hole punching, basically trying to initiate a connection on both ends. guessing exit ports and trying to convince the firewall that this it received a response from the other side so it should start routing traffic to that port back. The solution is not full proof and takes a few attempts to predict the outgoing ports.