Hello, Hen and Suvidth - thanks, i found where the problem was. I bypassed it using variable that took data from cb before it changed. Question that comes to is: what are the consequences of adding ex. char pkt_number[48] in skbuff struct? So that i can use it instead of char cb[48] that is used by osi layers (like in ip6_input.c)? I mean does it have any influence on proper router functioning.. regards adam - : 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