Package: iptables-ipv6

"iptables-ipv6" package binaries on CentOS:

/sbin/ip6tables-1.4.7 /sbin/ip6tables-multi-1.4.7 /sbin/ip6tables-restore-1.4.7 /sbin/ip6tables-save-1.4.7

You may install this package on CentOS with yum install iptables-ipv6