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Issues when translating between IPv4 and IPv6 - PowerPoint PPT Presentation


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Issues when translating between IPv4 and IPv6. Suresh Satapati Senthil Sivakumar Ronald van der Pol 56 th IETF, San Francisco March 19, 2003. Translation Problems. All problems that come with NAT NAT-PT (RFC 2766) DNS-ALG specification.

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Issues when translating between IPv4 and IPv6


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    Presentation Transcript
    1. Issues when translating between IPv4 and IPv6 Suresh Satapati Senthil Sivakumar Ronald van der Pol 56th IETF, San Francisco March 19, 2003

    2. Translation Problems • All problems that come with NAT • NAT-PT (RFC 2766) • DNS-ALG specification

    3. Desired address resolution

    4. Address resolution due to DNS-ALG

    5. Name resolution failure AAAA from v6  DNS-ALG  AAAA  A (no answer)  DNS-ALG (no answer) AAAA  DNS-ALG A or AAAA DNS resolver will ignore the subsequent answer

    6. Name resolution failure(contd.) Case 1: AAAA query  DNS-ALG  AAAA (1)  A (2) AAAA  DNS-ALG  AAAA (reply 1) Case 2: A query  DNS-ALG  AAAA AAAA  DNS-ALG  AAAA reply

    7. Name resolution failure (contd.) DNS-ALG cannot distinguish between cases 1 & 2 ‘A’ query results in a AAAA reply due to DNS-ALG Due to stateless nature…

    8. Scalability issues • Single exit point causes bottleneck. • Concern for 3GPP networks.

    9. NAT or NAT-PT • Dual stack hosts – Use NAT or NAT-PT ?

    10. WG item ?