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dns firewall

Configure Linux As Bastion Host

What is bastion host? How do I configure bastion host under Linux? How do I create a firewall for a bastion host under any Linux distribution?
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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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