iptables vs. ip6tables. Do I need both?

Project:Linux server
Component:Documentation
Category:support request
Priority:normal
Assigned:Unassigned
Status:active
Project wiki:server
Related pages:#295: iptables
Description

I know the difference between ipv4 and ipv6. My server having an ipv4 address and iptables being already configured, how and why should I configure ip6tables? Do I have the same rules as for iptables?