Re: [cf-dev] Scandium connection resumption vs. renegotiation

["Hudalla Kai (INST/ESY1)" <Kai.Hudalla@xxxxxxxxxxxx>]

Hi Achim,

You are right, the server cannot really "recognize" this. Scandium currently "implicitly deduces" that this is the case from the fact that the client indicates the session ID of the previously established connection. However, this also means that a client currently cannot create an additional connection to the server based on an existing connection. I think we should change this behavior so that the server simply negotiates the additional connection with the client based on the existing connection and let the client decide whether it wants to continue to use both connections (old and new) or just the newly created connection. In the latter case the existing connection will simply time out on the server side and be "garbage collected".

Does that make sense?

Regards,
Kai


-----Original Message-----
From: cf-dev-bounces@xxxxxxxxxxx [mailto:cf-dev-bounces@xxxxxxxxxxx] On Behalf Of Kraus Achim (INST/ESY1)
Sent: Wednesday, February 24, 2016 1:10 PM
To: Californium (Cf) developer discussions
Subject: Re: [cf-dev] Scandium connection resumption vs. renegotiation

Hi,

the wiki page mentions:

"The DTLSConnector running on the server side will recognize that the client's IP address/port has changed and will silently discard the previously established connection after the handshake has completed."

How does the server identify the client (to discard the old connection), if it could not use the address/port because this changed?

Mit freundlichen Grüßen / Best regards

Achim Kraus

Bosch Software Innovations GmbH
Communications (INST/ESY1)
Stuttgarter Straße 130
71332 Waiblingen
GERMANY
www.bosch-si.de
www.blog.bosch-si.com 

achim.kraus@xxxxxxxxxxxx

Registered office: Berlin, Register court: Amtsgericht Charlottenburg, HRB 148411 B
Executives: Dr.-Ing. Rainer Kallenbach; Michael Hahn



-----Ursprüngliche Nachricht-----
Von: cf-dev-bounces@xxxxxxxxxxx [mailto:cf-dev-bounces@xxxxxxxxxxx] Im Auftrag von Hudalla Kai (INST/ESY1)
Gesendet: Mittwoch, 24. Februar 2016 11:47
An: Californium (Cf) developer discussions
Betreff: [cf-dev] Scandium connection resumption vs. renegotiation

Hi,

Simon and I have been discussing for some time now about when and how a client would want to reconnect to a server and how these use cases are to be implemented according to the DTLS spec.

I have created a Wiki page [1] identifying some relevant real world use cases we would like to cover with Scandium. I would now like to use this thread to discuss the use cases and then gradually add information to the Wiki page so that we get a consistent picture over time and do not lose information.

So if you have any opinion regarding this topic I would be glad if you joined this thread :-)

[1] https://github.com/eclipse/californium/wiki/DTLS-Connection-Renegotiation-vs.-Resumption

Regards,
Kai

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