Date: Sun, 23 Oct 2005 01:30:15 -0700 (PDT) From: kamal kc <kamal_ckk@yahoo.com> To: freebsd <freebsd-net@freebsd.org> Cc: freebsd <freebsd-hackers@freebsd.org> Subject: in_cksum() for ip packets with multiple mbufs Message-ID: <20051023083015.18292.qmail@web35705.mail.mud.yahoo.com>
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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. 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. help !! kamal __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com
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