On Fri, Nov 10, 2006 at 12:51:19PM -0500, Brian Haley wrote: > Al Viro wrote: > >On Fri, Nov 10, 2006 at 11:25:53AM -0500, Brian Haley wrote: > >>Since the only difference between echo requests and echo replies is the > >>ICMPv6 type value (which is a difference of 1), just subtracting one > >>from the request checksum will result in the correct checksum for the > >>reply. > > > >Um, no. That will *not* result in correct checksum. Please, RTFRFC 1071. > > I verified this works for echo request/reply on my IA64 box, > double-checked with ethereal/wireshark. Is there something specific in > RFC 1071 that I should be looking for?
Definition of checksum. See also include/net/ip.h::ip_decrease_ttl() for similar situation. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
