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Help with IPv6 (lemmy.world)

submitted 4 months ago by cakeofhonor@lemmy.world to c/selfhosted@lemmy.world

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My ISP recently made IPv6 available and I'm trying to figure out how to make it work with my network. The setup I have is an OPNsense box connected to my ISP's router and I'm using it to isolate my homelab from the rest of the network. However, the machines on my OPNsense LAN aren't being assigned IPv6 addresses that allow them to connect to the internet.

I can ping IPv6 sites from my OPNsense box and I see that it's being assigned a /64 prefix from the ISP router. If I use my laptop to connect to my ISP's router, I can visit IPv6 sites just fine as well. My devices in the OPNsense LAN also have IPv6 addresses and can ping each other using IPv6 but not the internet.

Are there special settings that I need to set for OPNsense to make this setup work? I've tried reading up on the different modes like SLAAC but I'm not quite grasping the concepts.

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[–] chronicledmonocle@lemmy.world -1 points 4 months ago

Prefix ID of 0x1 means "Use the first prefix available in the block as a /64 for the LAN". Essentially your ISP probably gave you a /48, /56, or /60. The firewall is giving prefix IDs to all of the /64s you can fit inside of one of these and allocating them numbers 1 through whatever. Each LAN you have can have its own prefix ID. A /60 has 16 /64 networks that you can subnet it into.