95.2、STUN

说明

1. 使用nugetlinker.stun，或源码 https://github.com/snltty/linker/tree/master/src/linker.stun
2. 以下是简单使用示例

StunClient stun = new StunClient();
StunNatBehaviorResult result = await stun.DiscoverNatBehaviorAsync("支持RFC 5780的服务器", 3478,
new StunClientOptions
{
    AddressFamilyMode = StunAddressFamilyMode.Ipv6Preferred,
    MaxAttempts = 3
}, token).ConfigureAwait(false);
StunNatMappingBehavior mapping = result.MappingBehavior;
StunNatFilteringBehavior filtering = result.FilteringBehavior;