in kernel 2.5 there is ipsec. can anybody tell me the differences between it and frees/wan? does it come from frees/wan? i can not find any documents about it's implement. Give me a help? now what i want to do is to insert some information into ip options in ipsec. I do not know whether this two ipsec ways support this implementation. yuan - : 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