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[multipathtcp] Questions on fallback/infinite map

Krishna Khanal <krishna.khanal2@citrix.com> Sun, 23 June 2013 04:55 UTC

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From: Krishna Khanal <krishna.khanal2@citrix.com>
To: "multipathtcp@ietf.org" <multipathtcp@ietf.org>
Thread-Topic: Questions on fallback/infinite map
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Date: Sun, 23 Jun 2013 04:54:49 +0000
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Subject: [multipathtcp] Questions on fallback/infinite map
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Hi,
                I have few doubts and questions on fallback in following situations:
1. What is the recommended action when a host receives a plain ack or data in the middle of transaction and there is a single subflow? RFC has taken care of receiving plain data or ack before the path is mptcp confirmed but I don't see any recommendation when it happens on middle of transaction.
2. Is infinite map/mp_fail unidirectional or bidirectional? Lets suppose host A sends mp_fail to host B, host B will send infinite map to host A and after that there is no DSS on the data packets from B to A and host A will send only plain ack to B. But lets suppose host A also has some data to send to host B, can host A still use DSS and host B can send data ack in this case? I don't see RFC mentioning any recommended action in this case, so I believe host A can still use DSS with data and host B can send data ack.

Regards,
Krishna

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