I just wanna know few things , i have installed red hat 9, iptable is installed.

Now the thing is, i didnt know at first that i have to load the modules, i was getting the message

iptables: No chain/target/match by that name

so after couple of searches i did find some help and i manage to apply few commands i.e.

modprobe ip_tables
modprobe ip_conntrack
modprobe iptable_nat
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp

iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP
iptables -A INPUT -p icmp --icmp-type 8 -j DROP

all the above commands are accepted at command prompt, but when i try to use this command

iptables -A PREROUTING -s xxx.xxx.xxx.xxx/yyy.yyy.yyy.yyy -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080 where xxx is any IP and yyy is the subnet mask, it returns me the same message i.e.
iptables: No chain/target/match by that name

So it also give the same message with POSTROUTING.

also i dont wana load the modules and the commands each time the system starts, so when i type the commands i used iptables-save command to save tat, also is there ne possibility where i can store the command and execute when system startsup