IPv6 and pfSense 2.1.5 64 bit
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 @hda: You know…, IPv6 is a parallel system to IPv4. So ask your ISP to supply you IP in dual stack. And once that failed: :P https://www.tunnelbroker.net/ 
 https://doc.pfsense.org/index.php/Using_IPv6_with_a_Tunnel_Broker
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 https://www.tunnelbroker.net/ Sure. But the future is native IPv6 so ask for it or IPv4. 
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 @hda: But the future is native IPv6 so ask for it or IPv4. The "future" as seen here: Ask for IPv6, lose your IPv4 public IP, get behind CGN with a single dynamic /64. Thanks but no thanks. (Sincere greetings to O2 idiots). 
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 When I enable the "Allow IPv6" and "Enable IPv4 NAT encapsulation of IPv6 packets" options, which valid IPv6 address I should give to the firewall and which rule I should additional to the firewall to allow also the passage of IPv6 packets? Thanks Bye 
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 Uh. Start with your ISP, checking how they supply IPv6 (if at all). 
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 When I enable the "Allow IPv6" and "Enable IPv4 NAT encapsulation of IPv6 packets" options, which valid IPv6 address I should give to the firewall and which rule I should additional to the firewall to allow also the passage of IPv6 packets? Note: My firewall hardware is connected to an ADSL router as my ADSL uses the PPPoA protocol. Thanks Bye 
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 … Enable IPv4 NAT encapsulation of IPv6 packets ... WHY do you need IPv6 ? IPv6 is meant as a public addressing system that you manage with inbound/outbound allowances. 
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 When I enable the "Allow IPv6" and "Enable IPv4 NAT encapsulation of IPv6 packets" options, which valid IPv6 address I should give to the firewall and which rule I should additional to the firewall to allow also the passage of IPv6 packets? Dude, the answer is still the same. Get to your ISP and bring us some info!!! 
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 @hda: … Enable IPv4 NAT encapsulation of IPv6 packets ... WHY do you need IPv6 ? 
 IPv6 is meant as a public addressing system that you manage with inbound/outbound allowances.Because I have some programs that also use the IPv6 protocol. Can you mention an example, a typical program that wants to go public while there is no public IPv6, but that will refuse to take the IPv4 instead ? What brand-type of MoDem-Router/Switch do you have ? 
 Is your Internet Service Provider able to offer you IPv6 ?