My first IPv6 problem – multihoming my home network without NAT

August 10, 2014

Today I ran into my first IPv6 problem … all was easy so far for some years .. just configured it and it worked … but this weekend I deployed a second Internet connection for my home. With IPv4 and masquerading the internal IP addresses to the one provider-given IP addresses I was able on the router to configure which traffic goes out over which provider. If one provider fails the route is withdrawn and all goes over the other link. But now comes IPv6 and it is not that easy anymore, as my router does not support IPv6 NAT. The problem is described in detail in this nice blog post by Ivan Pepelnjak.

My router is able to do VRF (Virtual Routing and Forwarding) also for IPv6 (at least the documentation says so .. didn’t try it so far). So the “best” option for me seems to advertise both subnets the providers gave me to the clients and route source based to the providers. Without VRF I would be depended that the providers don’t do a RPF (Reverse Path Forwarding) check, which is also not a good idea. But this leads to the problem that the end device decides which uplink it uses, which is most likely not the one I would choose ….

An other idea was to use one of my servers in a data center to tunnel the traffic through. Basically running two IP tunnels from my router to the server (one via each provider) and using IP addresses that are routed from the Internet to the server. But this is also not a good solution.

Anyway I don’t have good solution so far, maybe one of my readers does.

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My first IPv6 problem – multihoming my home network without NAT

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