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

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Message-ID: <2ce42f10-8884-074e-9992-edd29db22d5d@candelatech.com>
Date:   Mon, 25 Jan 2021 07:18:18 -0800
From:   Ben Greear <greearb@...delatech.com>
To:     David Ahern <dsahern@...il.com>, netdev <netdev@...r.kernel.org>
Subject: Re: VRF: ssh port forwarding between non-vrf and vrf interface.

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

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

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com