[PLUG] Leroy Cressy speaking on IPtables Monday

[Chuck Peters <cp@ccil.org>]

6/17 Linux SIG meeting in Exton.

At this month's Linux SIG Leroy Cressy will be speaking about IPtables
firewalling with Linux and Blocking the Nimba virus/worm.  See
http://linux.extonpccouncil.org for more information.

Linux Firewalls are an effective tool for protecting networks.  Linux
firewalls are used for Enterprise level, as well as home systems.

Have you been wondering what do do with that old PC? Put it to good use
and protect your machines by making it a firewall/gateway for your home
network. The tool to configure kernel level firewalling for the 2.4
Linux kernels is called IPtables.

Many home computers as well as servers were affected by the nimba worm.
The worm continues to be a problem and an annoyance for many
administrators, as it attacks MS IIS servers as well as cluttering
apache log files.  Some of the advanced features of IPtables and a
little kernel patching can block these worms and protect your systems.

Home users can use a program called GShield to simplify the setup of
IPtables to protect their networks.

What is netfilter/iptables?

The netfilter/iptables project is the Linux 2.4.x / 2.5.x firewalling
subsystem. It delivers you the functionality of packet filtering
(stateless or stateful), all different kinds of NAT (Network Address
Translation) and packet mangling.

If you are running a recent Linux system (Kernel 2.4.x or above) on a
router, you can use netfilter/iptables for all kinds of firewalling, NAT
or other advanced packet processing.

The major part of netfilter/iptables (doing all the hard work) is
included in the standard Linux Kernel. In order to do your runtime
configuration of the firewalling subsystem, you will need the iptables
userspace command, which can be downloaded from here. Note that in most
cases, the vendor of your Linux distribution (Debian, RedHat, SuSE,
Conectiva, Mandrake, ...) will provide you with a pre-built version of
this tool.

If you are interested in these topics, please join us at the Chester
County Library in Exton on Monday June 17.  The library is located in
the center of Exton, near the intersection of Rt. 100 (Pottstown Pike)
and Business Rt. 30 (Lancaster Ave.). It is next to the Exton Square
Mall.

Chester County Library
450 Exton Square Parkway
Exton, PA 19341


Thanks,
Chuck


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