Re: [ippm] [**EXTERNAL**] Re: AD review of draft-ietf-ippm-stamp

Mirja Kuehlewind <ietf@kuehlewind.net> Mon, 19 August 2019 15:25 UTC

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From: Mirja Kuehlewind <ietf@kuehlewind.net>
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Date: Mon, 19 Aug 2019 17:24:54 +0200
Cc: "Civil, Ruth" <gcivil@ciena.com>, Henrik Nydell <hnydell@accedian.com>, Greg Mirsky <gregimirsky@gmail.com>, "rrahman@cisco.com" <rrahman@cisco.com>, Shahram Davari <shahram.davari@broadcom.com>, "draft-ietf-ippm-stamp@ietf.org" <draft-ietf-ippm-stamp@ietf.org>, IPPM Chairs <ippm-chairs@ietf.org>, IETF IPPM WG <ippm@ietf.org>, "draft-ietf-ippm-twamp-yang@ietf.org" <draft-ietf-ippm-twamp-yang@ietf.org>
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To: Rakesh Gandhi <rgandhi.ietf@gmail.com>
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Subject: Re: [ippm] [**EXTERNAL**] Re: AD review of draft-ietf-ippm-stamp
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Hi Rakesh,

Just quickly a comment on this bit:

> On 19. Aug 2019, at 17:12, Rakesh Gandhi <rgandhi.ietf@gmail.com>; wrote:
> 
> TWAMP Yang model [draft-ietf-ippm-twamp-yang-13] can also support the range to allow user ports. An example caveat is specified in [draft-ietf-tram-turnbis-29] 
> as "unless the TURN server application knows, through some means not
>    specified here, that other applications running on the same host as the TURN server application will not be impacted by allocating ports outside this range. "
> 
I don’t think it is the same thing for turn and stamp/twamp. 

In turn you aim at actually opening a connection to a remote endpoint and need to make sure that that endpoint is talking the same protocol as you do. That remote endpoint might actually implement different services on different ports. 

TWAMP is used for testing, therefore it could make sense to set up a testing server that listens on exactly the same port as your application would usually do. Yes, when using twamp on such ports, you have to make sure that your twamp server does not implement another protocol on that port but often these server are decided for testing only and preconfigured in a respective way.

Mirja