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RFC 1071, "Computing the Internet checksum", September 1988

Note: This RFC has been updated by RFC 1141

Source of RFC: Legacy
Area Assignment: int
See Also: RFC 1071 w/ inline errata

Errata ID: 4918
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Cihangir Akturk
Date Reported: 2017-01-26
Verifier Name: Éric Vyncke
Date Verified: 2025-06-27

Section 4.1 says: 

while( count > 1 )  {
        /*  This is the inner loop */
        sum += * (unsigned short) addr++;
        count -= 2;
}

It should say:

while( count > 1 )  {
        /*  This is the inner loop */
        sum += * (unsigned short *) addr;
        addr += 2;
        count -= 2;
}

Notes:

- In the original text, code incorrectly casts from pointer to integer.
- Increments addr pointer by 1. Because unsigned short is two bytes, it should have been incremented by 2 instead.

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