Re: Error trying to create gre tunnel

[D'Arcy Cain <darcy%NetBSD.org@localhost>]

On 08/11/2017 12:37 PM, D'Arcy Cain wrote:
> I made this work on one NetBSD system but two machines on the local side 
> fail.  One is a 7.1 server and the other is current.
>
> ifconfig gre0 create
> ifconfig gre0 10.255.255.1 10.255.255.2 netmask 255.255.255.252
> ifconfig gre0 tunnel 207.35.13.14 98.158.139.79
>
> The last line gives this error.
>
> ifconfig: SIOCSLIFPHYADDR: Can't assign requested address
>
> Both of those addresses are live, public addresses.  I can ping either 
> one from the machine I am trying to use as the tunnel endpoint.  Why 
> would this work on the remote side but not the local side?
>
> Even after the error I am able to add a route to the remote network but, 
> of course, it doesn't work.

It turns out that I misunderstood the example.  Both servers need to be 
on the public Internet.  In my case only the remote was.

Is there some way to do this?  I can port forward but I suspect that 
that won't work as it doesn't use TCP or UDP over the tunnel.  I looked 
at OpenVPN but that only allows individual hosts to connect.  I am 
trying to join two internal networks.

I can get a second IP address for my system but I need something that 
works for other clients who may not have that option.

--
D'Arcy J.M. Cain <darcy%NetBSD.org@localhost>
http://www.NetBSD.org/ IM:darcy%Vex.Net@localhost