On Wed, 27 Jan 1999 10:37:28 PST 
 Bill Fenner <fenner@parc.xerox.com> wrote:

 > 4.2.2.5 Header Checksum: RFC 791 Section 3.1
 >    
 >    As stated in Section [5.2.2], a router MUST verify the IP checksum of
 >    any packet that is received, and MUST discard messages containing
 >    invalid checksums.  The router MUST NOT provide a means to disable
 >    this checksum verification.

Well then, I guess that pretty much answers the question, eh? :-)

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>