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ip6tables command

I am a new Ubuntu Linux version 12.04 LTS user. How do I stop or start iptables based firewall service on Ubuntu Linux using bash command line options?
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RHEL / Centos Linux Disable Firewall

How do I disable firewall on CentOS or Red Hat Enterprise Linux server version 5.x/6.x running on my HP micro server?
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How do I install iptables under Redhat (RHEL) or CentOS or Fedora Linux operating systems?
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HowTo: Flush Iptables Under Ubuntu Linux

How do I flush all IPv4 and IPv6 iptables rules under Ubuntu Linux?
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I know how to configure iptables (IPv4) host-based firewall using Netfilter. How do I configure ip6tables for basic filtering IPv6 packets?
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ip6tables: IPv6 Firewall For Linux

Q. IPv4 by default protect internal host using RFC 1918 private IP address. But IPv6 offers direct global address which result into exposing all internal hosts as well. How do I create default IPv6 firewall to drop all incoming (except ping6 request) connection and only allow outgoing requests from Linux workstation?
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