On 2005-10-23 01:30, kamal kc <[EMAIL PROTECTED]> wrote: > i come across this unusual problem. > > i changed the ip_tos field of the struct ip and computed the checksum > by using in_cksum(). > > when the packet uses only one mbuf the computed checksum is ok but > when the packet uses more than one mbuf then the computed checksum is > wrong.
Note that the IP header contains a checksum of the IP header only. A common mistake is to calculate the checksum of data too, which results in an invalid IP header checksum. > eg. pinging with payload less than 1470 bytes is ok but with payload > greater than 1480 bytes does not work. (the error being bad checksum > --that i knew by capturing network packets by ethereal) > > is it a real problem or i have made some mistake. > > i put the code before the if_output() in the ip_output() function. Show us the diff, if possible :) _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
