RFC 4459 on MTU and Fragmentation Issues with In-the-Network Tunneling

A new Request for Comments is now available in online RFC libraries.

        RFC 4459

        Title:      MTU and Fragmentation Issues with 
                    In-the-Network Tunneling 
        Author:     P. Savola
        Status:     Informational
        Date:       April 2006
        Mailbox:    psavola@funet.fi
        Pages:      14
        Characters: 32051
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-savola-mtufrag-network-tunneling-05.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4459.txt

Tunneling techniques such as IP-in-IP when deployed in the middle of
the network, typically between routers, have certain issues regarding
how large packets can be handled: whether such packets would be
fragmented and reassembled (and how), whether Path MTU Discovery
would be used, or how this scenario could be operationally avoided.
This memo justifies why this is a common, non-trivial problem, and
goes on to describe the different solutions and their characteristics
at some length.  This memo provides information for the Internet community.

INFORMATIONAL: This memo provides information for the Internet community. 
It does not specify an Internet standard of any kind. Distribution
of this memo is unlimited.

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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

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