You can see the default rules under: iptables -> Filter Table -> RH-Firewall-1-INPUT Chain, as shown below. Loading additional iptables modules: ip_conntrack_netbios_n Start the iptables firewall as shown below. In our 1st part, we discussed about IPTables Tables, Chains, Rules Fundamentals.īefore we start learning how to add firewall rules using iptables, it is helpful to understand how to cleanup all the existing default rules and start everything from scratch.
This article is part of an ongoing iptables tutorial series. It is good idea to clean them up, and start from scratch. On Red Hat based Linux, iptables comes with certain default rules.
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