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Old 06-16-2010, 11:30 AM   #1
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Registered: Jun 2010
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So I am new to ubuntu and am trying to work with "iptables". I have ubuntu version 10.04, in the terminal I try to create a new iptable by writing:

iptables -N chain

but the response is:

FATAL: Error inserting ip_tables.........

can anyone help?

also it says "you must be root", what does root mean?

Last edited by dburrel8; 06-16-2010 at 11:31 AM. Reason: missed info
Old 06-16-2010, 11:47 AM   #2
Registered: Dec 2005
Location: norfolk, va
Distribution: kubuntu, debian
Posts: 36

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the "chain" on the end shoud be the name of the new chain. you might want to look at what is already in your iptables first with
# iptables -L
im pretty sure all these action have to be done as root.
you can become root by typing
# sudo su
and entering your password.
or use sudo like this.
$sudo iptables -L
in the future you might want to try
$ man iptables
# iptables --help
befor posting.
most console applications/commands have build in help or man(manual) pages. There are also some great tutorials on the web about this subject.
Old 06-16-2010, 04:04 PM   #3
Registered: Feb 2009
Distribution: Debian, CentOS 5, Gentoo, FreeBSD, Fedora, Mint, Slackware64
Posts: 208

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To answer your secondary question directly:
also it says "you must be root", what does root mean?
"root" is a user defined on pretty much all UN*X systems. It is basically a "system administrator" account with permission to do just about anything. You can become "root" by doing an "su" command and typing the password. You can run programs as root by using the "sudo" command if you have permissions to run this.

EDIT: root user is very powerful. So, as a general rule, you should not run things as "root" unless you need to. Some programs, like iptables, do require you to run as root because they work directly with the core of the system.

Last edited by nuwen52; 06-16-2010 at 04:08 PM.


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