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The ipset utility is used to administer IP sets in the Linux kernel. If the set is used more than once a saving in configuration time is made. For example: Jun 17, 2010 How do I configure a host-based firewall called Netfilter (iptables) under CentOS / RHEL / Fedora / Redhat Enterprise Linux? Netfilter is a The iptables service stores configuration in /etc/sysconfig/iptables and /etc/sysconfig/ip6tables The ipset utility is used to administer IP sets in the Linux kernel. The Firewall Configuration Tool only configures a basic firewall. As of Red Hat Enterprise Linux 6.5, the iptables and ip6tables services now provide the ability The -A option appends a rule at the end of an existing ruleset. The chain is the name of the chain for a rule. The three built-in chains of iptables (that is, the Saving and Restoring the Network Configuration · 18. .. IPTables. Included with Red Hat Enterprise Linux are advanced tools for network This chapter focuses on packet filtering basics, defines the differences between ipchains and iptables For example, to allow access to port 80 on the firewall, append the following rule: iptables -A INPUT -p tcp --dport 22 -j ACCEPT iptables -A OUTPUT -p udp IPTables. Included with Red Hat Enterprise Linux are advanced tools for network rules can only reference numeric IP addresses (for example, 192.168.0.1). Jun 20, 2014This executes the iptables initscript, which runs the /sbin/iptables-save program and writes the current iptables configuration to /etc/sysconfig/iptables .