Hello, i want know how 2.4 kernel decides which sequence no. to be sent with next packet? I am unable to find the location in kernel? Also what does following statement does? TCP_SKB_CB(__skb)= ((struct tcp_skb_cb *)&((__skb)->cb[0])) in tcp.h regards, cranium2003. __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - 100MB free storage! http://promotions.yahoo.com/new_mail -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/