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dksoft
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Posts: 148
Joined: Thu Dec 06, 2012 8:56 am
Location: Germany

Question: Best practice on IPv6NAT

Tue Aug 31, 2021 5:43 pm

I am playing around with IPv6NAT on 7.1rc1, which is much cooler than I first though. Hopefully this starts no discussion about use or don't use of IPv6NAT!

Now all local clients have fd00::xxx addresses and the router at fd00::1 does IPv6NAT/port forwarding.
Works fine on MacOS, Linux and IOS. I can ping/curl everything via IPv6.

But there is one problem: Now that the clients have no longer a global unique address, IPv6 is no longer favoured over IPv4.

What is the best practice to use IPv6NAT and have clients use IPv6 first?
 
sep
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Posts: 25
Joined: Thu Nov 28, 2013 2:34 pm

Re: Question: Best practice on IPv6NAT

Tue Aug 31, 2021 8:27 pm

your ipv6 ULA address space would be used if you did not have ipv4 on lan, so you an use it for a ipv6 only network.

I can see some nihe uses for IPv6NAT.
perhaps like hijacking dns queriesr and forcing them to your local pihole.
temporary move a service to another ip with port forwarding while you wait for the dns to update.

but using it as a address conservation method for LAN like we do on ipv4 is pointless. use GUA address on lan like normally. you have more addresses there then i can pronounce.
and with GUA addresses, ipv6 would actually be used as well.

But if your ISP have a broken ipv6 implementation,( perhaps does not give prefixes) you can use it as a workaround there.. but that is not a normal deployment.

good luck

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