iptables

linux

User-space utility program for configuring Linux kernel firewall rules implemented as part of Netfilter

Pronunciation

Correct

IP-tay-buls

/ˈaɪˌpiːˈteɪbəlz/

'IP' is spelled out as letters I-P (Internet Protocol), followed by 'tables' as a standard English plural noun.

Source: www.netfilter.org(official docs)