RE: IPTables Routing Help

[Fought,Tom]

Get a copy of Securing and Optimizing Linux by Gerhard Mourani.

In the meantime, go to their website and download some good

template files for iptables.

 

http://www.openna.com/products/books/securing-optimizing-linux/

 

grab the floppy-2.0.tgz file.

 

I have found this to be a good reference and you will find their

book in pdf format there I believe.

Tom

 

 

-----Original Message-----
From: Jon Gaudette [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 13, 2002 7:52 PM
To: [EMAIL PROTECTED]
Subject: Re: IPTables Routing Help

I was wondering if someone could help me here.  I'm despite!

I am attempting to setup a NAT router and firewall on my internal network.  It's function would be to provide an area of protection between myself and the rest of the network.  Also, I have been seriously learning Linux, and this is the next logical step.  Here's the problem, I don't have a clue what to do!  Every documentation that I find seems to contradict each other.  I am using RedHat 7.3 from downloaded ISO images.  Upon install I have installed iptables and other routing "stuff".

Upon setting it up (adding the info to my '/etc/sysconfig/network' file, etc.) One book I have states that I am to run modprobe ip_tables.  When I do so, all hell breaks loose.  Here is my error message.

[root@natrouter root]# modprobe ip_tables
/lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: init_module: Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters
/lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: insmod /lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o failed
/lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: insmod ip_tables failed
[root@natrouter root]# 

Now, I'm lost as it is, so this just completely doesn't make sense.  This is an install from a RedHat 7.3 cd, so I'm assuming the problem is in something that I am doing.  Any help would be appreciated.

I'd also be interested in any books / documentation that explains setting up iptables for nat routing on a simple lan in "n00b" terms.  When it comes to this aspect of the "Power of Linux" ... I'm lost.  But hey, give me credit ... I want to learn.

-Jon "GenKiller" Gaudette

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