Re: IPv6 tunneling not routing packets

[Brook Milligan <brook%biology.nmsu.edu@localhost>]

> On Dec 14, 2025, at 10:47, Jonathan A. Kollasch <jakllsch%kollasch.net@localhost> 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
> 
> If it's a public address on the host, then you'll need to make sure your
> ISP isn't blocking IPv4 protocol 41 in either direction.  (I've seen
> a USA residential DOCSIS provider do this.)

I’m pretty sure this is the problem, though I’m not exactly sure how to verify that. 

However, I tried on a different network routed via a different ISP and all works perfectly.  Thanks for the suggestion.

Also, thanks (!) to everyone who spoke up with a great set of ideas.  I really appreciate the assistance.

Cheers,
Brook