IPv6 WAN Track Interface not assigning addresses to LAN/Public LAN
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^ exactly! suggesting they use part of the global space 2000/3 is just not right... 2000 has not been allocated yet.. Doesn't mean you can just freaking use whatever space you want in it.
Concur if you were going to do such a hack, which I wouldn't suggest at all. Then yes ULA space would be the way to go, prob look into central assigned... have to lookup the rfc - its to prevent overlap how you can run into with rf1918 space..
If what you want is to use ula internal - then sure go for it, and do your Npt with that.. If he is having issues with his isp and getting prefix to work, etc. I would bet some serious money its the isp doing something wrong! ;)
The correct solution would be to figure out what is wrong, so maybe the isp can be informed, pfsense can be setup to allow for whatever is causing the issue, etc. etc.
But no some nat to whatever his isp gives him via some /64 on his wan and natting that is not the path.. Might be something you could do if hey need this up NOW... But this isn't production, the OP has zero actual "need" for ipv6.. Since really nobody actually does.. Unless there was some black site p0rn site he needed to get to that only is on ipv6 ;)
So figure out what the actual problem is and fix correctly..
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So much bad information in this thread. I'm locking it. Start another one with whatever the current problem is. Thanks.