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To: Ben Greear , netdev References: <7dcd75bb-b934-e482-2e84-740c5c80efe0@candelatech.com> <2dbd0ccb-9209-5682-0ae2-207cc02086ab@gmail.com> <2ce42f10-8884-074e-9992-edd29db22d5d@candelatech.com> From: David Ahern Message-ID: <9f442307-dd27-7493-3774-4ec72f344003@gmail.com> Date: Tue, 26 Jan 2021 10:28:43 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <2ce42f10-8884-074e-9992-edd29db22d5d@candelatech.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 1/25/21 8:18 AM, Ben Greear wrote: > 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? > 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.