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

Matthieu Baerts <matthieu.baerts@tessares.net> Thu, 11 June 2020 16:53 UTC

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To: Olivier.Bonaventure@uclouvain.be, Toerless Eckert <tte@cs.fau.de>
References: <20200611162904.GO16371@faui48f.informatik.uni-erlangen.de> <c3a6428e-7351-fab4-31c7-3cf909bdd6e9@uclouvain.be>
Cc: multipathtcp@ietf.org
From: Matthieu Baerts <matthieu.baerts@tessares.net>
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Date: Thu, 11 Jun 2020 18:53:23 +0200
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Subject: Re: [multipathtcp] mptcp quick Q: MP-TCP for address redundancy
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Hello,

On 11/06/2020 18:41, Olivier Bonaventure wrote:
>> 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

If it is not an issue for you to open subflows but not using them for 
some interfaces, subflows can have the "backup" flag set.

With the out-of-tree Linux kernel, "backup" subflows will only be used 
if there is no other "non-backup" subflow. Maybe this could help you.

http://multipath-tcp.org/pmwiki.php/Users/Tools

Cheers,
Matt
-- 
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net

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