Subject: RFC 4963 on IPv4 Reassembly Errors at High Data Rates

From: [email-masked]
Date: Fri, 27 Jul 2007 14:33:30 -0700 (PDT)

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

        RFC 4963

        Title:      IPv4 Reassembly Errors at High 

                    Data Rates 

        Author:     J. Heffner, M. Mathis,

                    B. Chandler

        Status:     Informational

        Date:       July 2007

        Mailbox:    [email-masked], 

                    [email-masked], 

                    [email-masked]

        Pages:      10

        Characters: 22399

        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-heffner-frag-harmful-05.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4963.txt

IPv4 fragmentation is not sufficiently robust for use under some

conditions in today's Internet.  At high data rates, the 16-bit IP

identification field is not large enough to prevent frequent

incorrectly assembled IP fragments, and the TCP and UDP checksums are

insufficient to prevent the resulting corrupted datagrams from being

delivered to higher protocol layers.  This note describes some easily

reproduced experiments demonstrating the problem, and discusses some

of the operational implications of these observations.  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

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