I am using Ubuntu 12.04 . while learning some new things about iptables i cant through this . see at the image . while i am trying to start ,its saying as

 root@badfox:~# iptables -L -n -v
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
root@badfox:~# service iptables stop
iptables: unrecognized service
root@badfox:~# service iptables start
iptables: unrecognized service

Source: http://www.cyberciti.biz/tips/linux-iptables-examples.html

Why i am getting like this ?

EDIT: So my firewall already started but why i am not getting the output as i mentioned in the link at source link in first workout. .

Here is my output

root@badfox:~# sudo start ufw
start: Job is already running: ufw
root@badfox:~# iptables -L -n -v
Chain INPUT (policy ACCEPT 4882 packets, 2486K bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 5500 packets, 873K bytes)
 pkts bytes target     prot opt in     out     source               destination         
root@badfox:~#