Yung-Sheng Tang wrote: > I am sorry that I don't get what you mean well. The multicast-sending > AP, mrouted and tcpdump all run on the same machine. From tcpdump > result, the multicast AP gives the right checksum, whereas > encapsulating module(?) gives the wrong checksum, right? So, What next > I should examine for?
Ah. I thought you might have a bad source host. See Mark Tinguely's post: he found the problem; it's a byte-order at the tme of calculation problem. I think you would have to HTONS(), do the checksum recalculation, and then HTONS() it back (or delay the recalculation untul after it was naturally HTONS()'ed, if possible). -- Terry To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
