Oliver Freyermuth edf2399ce6 Add NATSymmetricUDPFirewall to punchable NATs (#5931) ...

NATSymmetricUDPFirewall actually is not NAT at all, but means the machine has a global IP address and an UDP firewall in front (RFC calls it Symmetric UDP Firewall). This is punchable fine, both theoretically and also practically in testing.

2019-08-06 12:26:02 +01:00

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