Re: [netconf] time to meet today after 5pm

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 04 April 2019 16:42 UTC

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Date: Thu, 4 Apr 2019 18:42:11 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Patrick McManus <mcmanus@ducksong.com>
CC: Martin Bjorklund <mbj@tail-f.com>, <netconf-chairs@ietf.org>, <httpbis-chairs@ietf.org>, <netconf@ietf.org>
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Subject: Re: [netconf] time to meet today after 5pm
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On Thu, Apr 04, 2019 at 05:38:28PM +0200, Patrick McManus wrote:
> On Thu, Apr 4, 2019 at 4:33 PM Martin Bjorklund <mbj@tail-f.com> wrote:
> 
> >
> > I don't think this is correct.  In what way do you think RESTCONF
> > tries to use HTTP as a stateful transport?

[...]

> To give a concrete example, there may be a device, deployed behind a NAT,
> requiring a persistent management connection to its controller
> application.  Because the device is behind a NAT, it MUST initiate the
> connection (the controller cannot) and, thus the device MUST ensure
> aliveness of the connection to the controller (the controller *needs* the
> device-initiated connection to be up in order to send commands to the
> device).   In case the controller disappears, perhaps due to its
> data-center being hit by a meteor, the device must promptly detect to loss
> and initiate reconnection to another controller.

The issue here seems to be a NAT requiring state, not the RESTCONF
protocol itself requiring state.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>