Re: VRF: ssh port forwarding between non-vrf and vrf interface.

On 1/25/21 8:18 AM, Ben Greear wrote:

On 1/22/21 8:02 AM, David Ahern wrote:

quoted

On 1/22/21 8:45 AM, Ben Greear wrote:

quoted

Hello,

I have a system with a management interface that is not in any VRF, and
then I have
a port that *is* in a VRF.  I'd like to be able to set up ssh port
forwarding so that
when I log into the system on the management interface it will
automatically forward to
an IP accessible through the VRF interface.

Is there a way to do such a thing?

For a while I had a system setup with eth0 in a management VRF and setup
to do NAT and port forwarding of incoming ssh connections, redirecting
to VMs running in a different namespace. Crossing VRFs with netfilter
most likely will not work without some development. You might be able to
do it with XDP - rewrite packet headers and redirect. That too might
need a bit of development depending on the netdevs involved.

Maybe easier to improve ssh so that it could specify a netdev to bind to
when
making the call to the redirected destination?

maybe. I did not realize this feature made it into ssh, but it has
supported 'rdomains' since 2017 I believe. For Linux rdomain is a VRF.