RE: cable modem access

[Jason Axley <jason.axley () attws com>]

I would really not advise continuing to run ipfwadm on linux.  This has
been replaced in newer kernels by a better method of firewalling called
'ipchains'.  There are patches to use ipchains with the 2.0.x kernels that
are rock solid too.  Stateful packet filtering is under development that
uses new firewall features in the 2.1 and 2.2 kernels as well.

Check out ipchains at:  http://www.rustcorp.com/linux/ipchains/!

-Jason

On Thu, 15 Apr 1999, Frank W. Keeney wrote:

> Date: Thu, 15 Apr 1999 08:40:21 -0700
> From: "Frank W. Keeney" <FKeeney () hsa com>
> To: "'firewall-wizards () nfr net'" <firewall-wizards () nfr net>,
>     'twalls - Troy Walls' <twalls () acxiom com>
> Subject: RE: cable modem access
>
> Up until January I had a cable "modem" in my house until I installed
> SDSL.
>
> I use a Linux box to act as a firewall for my Win9x/NT computers. I use
> ipfwadm which is included with Linux. A sample ipfwadm "firewall"
> script:
>
> http://www.pasadena.net/linux/linuxsecure.html
>
>
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Frank Keeney, Network Services, Home Savings of America
> +1 626-814-5080 mailto:fkeeney () hsa com
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
>       ----------
>       From:  twalls - Troy Walls [SMTP:twalls () acxiom com]
>       Sent:  Wednesday, April 14, 1999 6:50 AM
>       To:  'firewall-wizards () nfr net'
>       Subject:  cable modem access
>
>       I know this group is dedicated to helping network administrators
> with firewall issues that they deal with at their workplace, however, I
> have a slightly different twist on my problem.  It is not directly
> workplace related.  
>
>       I have a cable modem at home.  I have some concerns about the
> security of the setup.  I have this installed on a stand alone machine
> whose only function is internet access.  I want to change that and put
> three other machines on the cable modem through a network.  I have
> installed Cat 5 cable, and purchased a 10/100 hub for this activity.   
>
>       I have considered a linux server as a front end and firewall,
> however, it will be a learning experience to get it up an running. Is it
> the best option as a firewall?  Are there better options?  I have a
> win95, a win98, and a NT4.0 workstation that I want to put behind a
> firewall.
>
>       My question is how can I protect those machines.  I have another
> machine that I can use as a firewall box. I just don't know what is
> available for my type of arrangement.
>       


AT&T Wireless Services
IT Security
UNIX Security Operations Specialist