Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!WLV.IMSD.CONTEL.COM!mcc
From: mcc@WLV.IMSD.CONTEL.COM (Merton Campbell Crockett)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: more on Fletcher
Message-ID: <8912060542.AA05854@WLV.IMSD.CONTEL.COM>
Date: 6 Dec 89 05:42:34 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 19

I fail to see the reason why an alternative form of checksum is required for
the TCP frame.  As I recall the original posting, the host (in this case, an
intelligent communications processor) received the data correctly.  The error
occurred in a subsequent transmission between the "host" and external memory.

The problem is that the vendor of the intelligent communications processor
did not fully understand or is not compliant with the protocol established
by the vendor of the computer to govern DMA operations.  Or, the vendor of
the computer did not adequately define or implement the defined DMA proto-
col.

In either case, it is not TCP that is the problem.  If it is, as indicated
in an earlier message, a known problem that can occur during DMA operations,
it is the computer manufacturer's responsibility to correct the error.  If
it is a problem that only occurs with DMA operations from the intelligent
communications processor, its manufacturer is responsible for correcting
the problem.

Merton