Hi There, I am trying to use TCP checksum offload under Linux. I found that if I install the netfilter, I cannot use TCP checksum offload feature. Because "nf_hook_slow" is called if there is any HOOK registered in the output path, and "skb->ip_summed" is set to "CHECKSUM_NONE" eventually. Am I right about that I cannot use TCP checksum offload feature if there is any HOOK registered in the output path? If it's right, how can I use TCP checksum offload feature while having the netfilter installed. Can I do it but disabling some netfilter options? Thanks, Bluesea __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com