Re: [netconf] Pullback tcp-client-server also?

[[e-mail]]

Re-,

As Joe rightfully mentioned, running different instances is likely to happen at the device level. For that case, the leaf-list approach is just fine.

Now, when the model is reused in upper layers (network or service models), that would not be sufficient. Think about a DHC service model which hides the internal of the service (whether this is dhcp or dhcpv6) but simply needs to expose where the dhc service is enabled: distinct ports are required for that case.

Cheers,
Med

De : Kent Watsen <[e-mail]>
Envoyé : mercredi 20 mars 2024 10:48
À : BOUCADAIR Mohamed INNOV/NET <[e-mail]>
Cc : Joe Clarke (jclarke) <[e-mail]>; Rob Wilton (rwilton) <[e-mail]>; [e-mail]
Objet : Re: [netconf] Pullback tcp-client-server also?

Hi Med,

Do you mean a list of “local-address + local-port” tuples?

Can you post a concrete proposal?

K.


On Mar 20, 2024, at 10:36 AM, [e-mail]<mailto:[e-mail]> wrote:

Re-,

This would address the first cases I mentioned, but not the third one.

At least some narrative text is needed to explain the intended use of distinct port per AF. A cleaner approach would to model this is as a list keyed per AF.

Cheers,
Med

De : Kent Watsen <[e-mail]<mailto:[e-mail]>>
Envoyé : mercredi 20 mars 2024 10:29
À : Joe Clarke (jclarke) <[e-mail]<mailto:[e-mail]>>
Cc : BOUCADAIR Mohamed INNOV/NET <[e-mail]<mailto:[e-mail]>>; Rob Wilton (rwilton) <[e-mail]<mailto:[e-mail]>>; [e-mail]<mailto:[e-mail]>
Objet : Re: [netconf] Pullback tcp-client-server also?

Thanks Med and Joe.  I had a sidebar with Rob and Mahesh, and we’re going to do this update in Auth48.

Let us (the WG) agree on the exact change.
  1) change ‘leaf’ to ‘leaf-list’
  2) tweak the ‘description’ to say that it’s a list

Anything else?  Do we need to disallow shadows?  (e.g., two wildcards)

K.


On Mar 20, 2024, at 9:02 AM, Joe Clarke (jclarke) <[e-mail]<mailto:[e-mail]>> wrote:

I agree with Med.  Your description is an either/or, but one server might do something like:

tcp46      0      0 *.9100                 *.*                    LISTEN <== Listen on all v4 and v6 addresses

Or:

tcp4       0      0 127.0.0.1.25           *.*                    LISTEN <== Listen on just v4 on an explicit address

Or:

tcp6       0      0 ::1.25   *.*                              LISTEN <== Listen on just v6 on an explicit address

In the first case, I’d think you’d at least need a leaf-list to hold both 0.0.0.0 and ::.  In the second two cases, you’d want this service to have a leaf list for 127.0.0.1 and ::1.

Joe

From: netconf <[e-mail]<mailto:[e-mail]>> on behalf of [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Date: Tuesday, March 19, 2024 at 18:23
To: Kent Watsen <[e-mail]<mailto:[e-mail]>>, Rob Wilton (rwilton) <[e-mail]<mailto:[e-mail]>>
Cc: [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Subject: Re: [netconf] Pullback tcp-client-server also?
Hi Kent, all,

When I initially raised the issue for the UDP grouping, I had in mind any, IPv4/IPv6 explicit address bindings, and eventually listening on distinct port numbers per AF. Given this is a reusable model, these cases should be all covered.

Cheers,
Med

De : netconf <[e-mail]<mailto:[e-mail]>> De la part de Kent Watsen
Envoyé : mercredi 20 mars 2024 06:54
À : Rob Wilton <[e-mail]<mailto:[e-mail]>>
Cc : [e-mail]<mailto:[e-mail]>
Objet : [netconf] Pullback tcp-client-server also?

Rob, Netconf,

Regarding support for “dual-stack”, do we need to convert from a “leaf” to a “leaf-list”?

Please note that the existing text says that a wildcard card may be used to bind to all addresses:


leaf local-address {

      type inet:ip-address;

      mandatory true;

      description

        "The local IP address to listen on for incoming

         TCP client connections.  INADDR_ANY (0.0.0.0) or

         INADDR6_ANY (0:0:0:0:0:0:0:0 a.k.a. ::) MUST be

         used when the server is to listen on all IPv4 or

         IPv6 address.";

    }

Good enough?

Kent


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