Re: TCP data corruption
Chris Murphy <lists-zXQU9YWDTqjmlV4oE/1sFAC/[email protected]>
| Newsgroups | gmane.comp.macosx.admin |
|---|---|
| Message-ID | <[email protected]> |
OK thanks. Chris Murphy On Apr 14, 2011, at 10:03 PM, Michael_google gmail_Gersten wrote: >> I understand, I'd like to just leave this at the physical layer at the moment. I'm curious if I understand TCP correctly, that just the header is checksummed, not the data. > >> From Wikipedia: > The checksum field is the 16 bit one's complement of the one's > complement sum of all 16-bit words in the header and text. > > That would say that your data is included in the checksum of TCP. > That matches everything I have learned about the point of the > streaming protocol and the general accuracy. > > Whether or not the 1's complement summation is sufficiently strong > enough or not I cannot say. > > IP's headers only checksum the header. The data portion of an IP > packet is not checksummed or protected by the IP header. > > The TCP portion contains both a TCP header and TCP data. All of it is > IP level data, ignored by the IP checksum, and all of it is contained > in the TCP level checksum. > > -- > Political and economic blog of a strict constitutionalist > http://StrictConstitution.BlogSpot.com > _______________________________________________ > MacOSX-admin mailing list > [email protected] > http://www.omnigroup.com/mailman/listinfo/macosx-admin