Other Considerations Security Considerations DHCP: authentication option (RFC3118) DNS: DNS Security Extensions (RFC4033) TCP: TLS (Transport Layer Security) for message confidentiality and data integrity (RFC4346) UDP: DTLS (RFC4347) IPsec: Where no transport layer security is available and server only authentication is required IANA Considerations I-D Registers TCP and UDP ports for MIH Transport If a port is not explicitly assigned, the default port number MUST be used |