Yung-Sheng Tang wrote: > > I am setting up a multicast router. Recompiling kernel with MROUTING > option and enabling mrouted are done. Basically, my multicast AP runs > well, but if that AP and mrouted run on the same machine, forwarded > packets would get udp checksum error. Here is the result from tcpdump:
[ ... ] > Did I make some mistake? Thank you for your attention. I have noticed a number of bad checksum instances, as well, in particular in the piggy-back ACK implementation of a former coworker, but did not track them down. It seems to me that this is the "one's complement" problem that the incremental checksum modification RFC update refers to, but I could be mistaken. I don't think that code is incredibly exercised in FreeBSD. On the other hand, you should also examine the packet in from the other machine, as the checksum might have started out broken. If so, an incremental update wouldn't correct it. -- Terry To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
