hole-punching – Tarik Billa

Java UDP hole punching example – connecting through firewall

September 8, 2023 by Tarik

This example is in C#, not in Java, but the concepts of NAT traversal are language-agnostic. See Michael Lidgren’s network library which has NAT traversal built in. Link: http://code.google.com/p/lidgren-network-gen3/ Specific C# File Dealing with NAT Traversal: http://code.google.com/p/lidgren-network-gen3/source/browse/trunk/Lidgren.Network/NetNatIntroduction.cs The process you’ve posted is correct. It will work, for only 3 out of 4 general types of … Read more

UDP hole punching not going through on 3G

September 3, 2023 by Tarik

Unfortunately, there is no 100% reliable way to perform NAT hole punching with UDP. At best, you can make some guesses about how NATs and firewalls will probably behave most of the time. But there will always be exceptions and they may not be rare. In this case, it sounds like you are using a … Read more