Chapter 9. Networking

iptables supports -C option

This update adds support for the -C check option to the iptables commands. Previously, there was no simple way to check if a certain rule existed. Now, the -C option can be used in a rule to check if a rule exists.

Support for IPv6 IP sets

This update adds support for IPv6 IP sets, as IP sets were not previously usable in IPv6 firewall rules.