Re: [Dime] Question regarding diameter session

Ivan Skytte Jørgensen <isj-dime@i1.dk> Thu, 29 June 2017 09:20 UTC

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From: Ivan Skytte =?ISO-8859-1?Q?J=F8rgensen?= <isj-dime@i1.dk>
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Date: Thu, 29 Jun 2017 11:20:32 +0200
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Subject: Re: [Dime] Question regarding diameter session
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On Thursday 29 June 2017 13:15:05 Ajinkya Joshi wrote:
> Hello,
> 
> >From the RFC 6733, it is clear that diameter session is identified bases on
> session-id, which has to be globally unique. Also in section 2.5
> (Connections vs Sessions), it's clearly mentioned that one connection can
> be used to multiplex multiple diameter sessions.
> I have following questions related to diameter session -
> 
> Is there any implicit correlation between diameter session and origin-host?

Only what is spelled out in the RFC "The Session-Id MUST begin with the sender's identity [...]"

A dubious diameter implementation may decode the session-id extracting what the origin-host might be. But that would be silly since it is already present in the origin-host AVP. Well-behaved diameter implementations treat session-id as an opaque string.

> Does diameter standard allow different requests for the same session to
> have different origin-host value?

Yes, eg RAR and ASR requests will have a typically have an origin-host/realm different from where the session-id was created.


/isj