Chapter 7. Firewalls
73
The syntax is identical to
iptables
in every aspect except that
ip6tables
supports 128 bit ad 
dresses. For example, SSH connections on a IPv6 aware network server can be enabled with the
following rule:
ip6tables  A INPUT  i eth0  p tcp  s 3ffe:ffff:100::1/128   dport 22  j \
ACCEPT
For more information about IPv6 networking, refer to the IPv6 Information Page at
http://www.ipv6.org.
7.3. Additional Resources
There are several aspects to firewalls and the Linux Netfilter subsystem that could not be covered here.
For more information, refer to the following resources.
7.3.1. Installed Documentation
The Official Red Hat Linux Reference Guide has a comprehensive chapter on iptables, including
definitions for all command options.
The
iptables
manual page contains a brief summary of the various options, as well.
7.3.2. Useful Websites
http://www.netfilter.org   The official homepage of the Netfilter/
iptables
project.
http://www.redhat.com/support/resources/networking/firewall.html   Red Hat Support firewall re 
source page.
http://www.tldp.org   The Linux Documentation Project contains several useful guides relating to
firewall creation and administration.
7.3.3. Related Documentation
Linux Firewalls, by Robert Ziegler, contains a wealth of information on building firewalls using
both 2.2 kernel
ipchains
as well as Netfilter and
iptables
. Additional security topics such as
remote access issues and Intrusion Detection Systems are also covered.






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