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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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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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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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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