On Fri, 17 Oct 2003 13:17:56 -0700 (PDT) Bluesea Yreen <big_bluesea@yahoo.com> wrote: > In "nf_hook_slow()" (netfilter.c), if skb->ip_summed > == CHECKSUM_HW and ouput interface is not NULL, TCP > checksum is calculated by calling > "skb_checksum_help()". Why is this needed? Because it wants the packet in the exact state it would be when it hits the wire. > "nf_hook_slow" is called everytime a packet is sent > out, if "Network packet filtering debugging" is chosen > when compiling the kernel. Does this mean that there > is no TCP checksum offload feature in this > circumstance? That's right, don't turn on debugging if you want performance. BTW, this question really belongs on the netfilter lists, you'd get quicker and more intelligent responses there. Thanks. - : 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
