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

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Date:   Fri, 22 Jan 2021 09:02:25 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ben Greear <greearb@...delatech.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: VRF: ssh port forwarding between non-vrf and vrf interface.

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