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While learning some new things about iptables I can't through this. 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:~#
Braiam
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Raja G
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    iptables isnt a service, it runs all the time, the only true way to stop the firewall is to flush the rules to get everything empty and to ACCEPT. What exactly are you asking, though? By default there never are any rules configured. – Thomas Ward Jul 09 '12 at 13:22
  • @LordofTime , click source link please – Raja G Jul 09 '12 at 14:11
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    The above commands shows you don't have any user defined rule.If by that you mean you want to learn the firewall , implemented by the iptables , then follow this answer , though my answer but it has relevant links to get you started on iptables in Ubuntu. Also see its man page.And please edit the question to What exactly you are asking in simple words. – atenz Jul 09 '12 at 14:23
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    Just a suggestion ,why don't you refer the Official iptables how to. – atenz Jul 09 '12 at 15:24
  • No (the why don't ) , was just a way of suggesting , not to ask the reason or any other thing :D . Thanks , i will never try that One-liner again :D. – atenz Jul 09 '12 at 15:50

2 Answers2

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The Uncomplicated Firewall or ufw is the configuration tool for iptables that comes by default on Ubuntu. So if you wanted to start or stop the ufw service, you'd have to do something like this

#To stop
$ sudo service ufw stop
ufw stop/waiting

#To start
$ sudo service ufw start
ufw start/running

About why you are not receiving the output as shown in the source. It clearly states there that the output you are receiving is for an inactive firewall, that is, no rules have been set. So try setting up some rules in iptables. Here's the Ubuntu Wiki on iptables that shows you how to set, edit them and such.

Nitin Venkatesh
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the service command works on RedHat-based systems with iptables very well, even on Centos 7, which has adopted systemd.

So if Debian-based systems don't consider iptables a service per se, it still might be thought of as one. And the command "service iptables restart" is actually very useful, especially when you want iptables to restore the 'default' rule (meaning, to use the main script; in centos /etc/sysconfig/iptables, etc.)

vinci
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