Re: [multipathtcp] mptcp quick Q: MP-TCP for address redundancy

Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be> Thu, 11 June 2020 16:41 UTC

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Reply-To: Olivier.Bonaventure@uclouvain.be
To: Toerless Eckert <tte@cs.fau.de>, multipathtcp@ietf.org
References: <20200611162904.GO16371@faui48f.informatik.uni-erlangen.de>
From: Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be>
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Date: Thu, 11 Jun 2020 18:41:00 +0200
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Subject: Re: [multipathtcp] mptcp quick Q: MP-TCP for address redundancy
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Hello,

> Could not easily find the answer to the following question:
> 
> Can i effectively use MP-TCP just to overcome possible loss of interfaces ?
> 
> E.g.: server and client each have two interfaces, connection is established
> from client interface 1 address to server interface 1 address, the
> additional addresses are exchanged via MP-TCP. Sometime during life-time
> of both client interface 1 and server interface 1 fail in short order.

Yes, this works.

> Q1: Can MP-TCP survive that ? That being general case of N addresses
> on client/server and N-1 address failures simulateneously.

Since MPTCP exchanges the different addresses, the client can try them 
in sequence to reach the server through the available one.

> Q2: If so, does it require full-mesh of subflows or any other setup
> of subflows ?

A full-mesh would open all subflows. You might need a reactive path 
manager that reacts to changes in subflows to recreate new ones, see 
e.g. chapter 7 of Viet Honag Tran thesis

https://inl.info.ucl.ac.be/publications/measuring-and-extending-multipath-tcp.html



Olivier