If the iptables-ipv6 package is
installed, netfilter under Red Hat Enterprise Linux can filter the
next-generation IPv6 Internet protocol. The command used to
manipulate the IPv6 netfilter is ip6tables. Most directives for this command are
identical to those used for iptables,
except the nat table is not yet supported.
This means that it is not yet possible to perform IPv6 network
address translation tasks, such as masquerading and port
Saved rules for ip6tables are stored in
the /etc/sysconfig/ip6tables file. Old
rules saved by the ip6tables initscripts
are saved in the /etc/sysconfig/ip6tables.save file.
The configuration file for ip6tables
initscript is /etc/sysconfig/ip6tables-config and the names for
each directive vary slightly. For instance, the iptables-config directive IPTABLES_MODULES is IP6TABLES_MODULES in the ip6tables-config file.