LARTC - May 2001 - sorry about my another question for iptables

I want to use iptables to modify my DSCP Code.
But I just type:
iptables -A PREROUTING -i eth0 -t mangle -p tcp...

then it tell me:
iptables v1.1.1: can''t initialize iptables table `mangle'' :
iptables who?(do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

I don''t know what''s the problem?????

And more ridiculous is...when I upgrade my kernel 2.2.16 to 2.4, I
can''t use the ipchains, tc.
System just tell me the protocol is not support.
But I cannot find the protocol in "make menuconfig -->Networking
Option"
Can someone give me some advice...thanks.


ps:Kernel 2.2.16 and 2.4 are the same result when I use iptables.