/sbin/ip6tables
/sbin/ip6tables-restore
/sbin/ip6tables-save
/sbin/iptables
/sbin/iptables-restore
/sbin/iptables-save
/sbin/xtables-multi
/usr/bin/iptables-xml
/usr/sbin/ip6tables-apply
/usr/sbin/iptables-apply
/usr/sbin/nfnl_osf
You may install this package on Debian with
apt-get
install iptables