<PackageReference Include="BouncyCastle.Cryptography" Version="2.5.0" />

Org.BouncyCastle.Tls.DtlsRecordFlags

public enum DtlsRecordFlags
namespace Org.BouncyCastle.Tls { public enum DtlsRecordFlags { None = 0, IsNewest = 1, UsesConnectionID = 2 } }