2.2.10 Security Realm Vendor ID Payload (IKEv2)

The "MSFT IPsec Security Realm Id" vendor ID payload SHOULD<10> be constructed as specified in [RFC5996] section 3.12. The vendor ID payload has a variable length field called Vendor ID or VID. In this extension, the first 16 bytes is an MD5 hash of the string "MSFT IPsec Security Realm Id". The subsequent bytes contain the actual Security Realm ID.<11>