On Tue, 2002-03-05 at 05:45, Ravi Kiran wrote: > hi all, > > i have a basic doubt w.r.tthe checksum computation for an ip header that iam constructing. > > currently i am following the steps given below: > > STEP 1. construct header (with zero in checksum) > STEP 2. convert 16-bit values in header to network byte order > (ip addresses are already in network byte order) > STEP 3. compute checksum on the header > STEP 4. convert checksum to network byte order and send the packet > > i am not sure whether i need to do STEP 4 above. > could some one clarify please? The checksum is actually byte-order-invariant; so you don't need to do steps 2 and 4. Check out RFC 1071 "Computing the Internet Checksum" for more detail and justification. > > thanks, > ravi. > > > - > : send the line "unsubscribe linux-net" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Casey Carter Casey@Carter.net ccarter@uiuc.edu AIM: cartec69 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
