On Sun, Dec 14, 2025 at 10:55 AM Jonathan A. Kollasch <[email protected]> wrote: > > On Sun, Dec 14, 2025 at 10:30:12AM -0700, Brook Milligan wrote: > > I am trying to set up an IPv6 tunnel via Hurricane Electric’s tunnelbroker > > service, but packets are not routed through the tunnel. > > > > After registering the tunnel, their instructions for NetBSD are to > > configure the network as follows: > > > > ifconfig gif0 create > > ifconfig gif0 tunnel x.x.x.x y.y.y.y > > Is the local address here in a public IPv4 prefix that is already > assigned to another interface on the host? RFC1918 prefixes or RFC6598 > CGNAT address space (100.64.0.0/10) will (almost certainly) not work for > protocol 41 tunnels.
Just as a data point: Before my ISP was using IPv6 I set up a tunnel with HE on my router, then advertised the prefix downward into my network. My NetBSD systems "just worked" with autoconfig. If the NetBSD system isn't on the bare internet, I don't think it will work. You might be able to set up some 1:1 forwarding scheme on your router to make it work, I don't know. MTU can become an issue. Andy
