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As IPv4 addresses are being exhausted, researches on how to implement IPv6 [1] on carrier network are becoming valuable. IETF Softwire Group has proposed many useful methods, such as the Layer Two Tunneling Protocol (L2TP), towards this end. This paper firstly explains L2TP [2] tunnel technology in detail and then proposes the deployments of gateway mode and host mode in 6in4 and 4in6 scenarios. At...
While VoIP spread widely, its deployments are isolated islands interconnected via the PSTN and E.164 phone numbers are still the universal addresses for phones. Mapping phone number to SIP address is essential for SIP peering based on phone numbers. The public ENUM designed for this has not been successful due to the complexity of phone number ownership delegation. This paper proposes a secure and...
Teredo is a service that enables nodes located behind one or more IPv4 Network Address Translations (NATs) to obtain IPv6 connectivity by tunneling packets over IPv4 UDP. Although Teredo is a useful protocol, it also has some weaknesses. It can not work with symmetric NAT, and it raises some security concerns, such as bypassing security controls, reducing defense in depth, and allowing unsolicited...
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