Re: [multipathtcp] A question related to MPTCP control overhead
Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be> Fri, 07 April 2017 18:59 UTC
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To: Sayee Kompalli Chakravartula <sayee.kompalli.chakravartula@huawei.com>, "multipathtcp@ietf.org" <multipathtcp@ietf.org>
From: Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be>
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Date: Fri, 07 Apr 2017 15:40:33 +0200
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Subject: Re: [multipathtcp] A question related to MPTCP control overhead
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Hello, > > This is the first time I’m posting a question to the group!! I work for > Huawei Technologies, India at Bangalore. For quite some time I’ve been > reading material on MPTCP, and of late, I have been thinking of a > potential issue related to MPTCP control overhead. I’m wondering whether > the issue I articulated in the following is worth considering, and if > so, I would love to hear opinion from the members of the group. I thank > you all in advance! Thanks for your email. Bascially, you would like to have a Multipath TCP connection that starts without DSS on this initial subflow and then enables the DSS when a second subflow has been established. This would reduce the overhead when MPTCP connections are composed of a single subflow. However, in the presence of middleboxes, it looks very difficult to design a solution that would preserve connectivity under all circumstances. Assume that MPTCP starts without any DSS option and only uses them after the establishment of the second subflow. If the bytestream has been affected by a middlebox (e.g. a NAT with an FTP ALG) that adds or remove bytes in the payload, when MPTCP will switch to using the DSS? they will be desynchronised with the actual sequence numbers that the receiver observers. There are other corner cases where DSS options are removed from packets with data but not from SYNs that could also result in various problems. The idea looks nice, but there are unfortunately many devils hidden in the details Olivier
- Re: [multipathtcp] A question related to MPTCP co… Sayee Kompalli Chakravartula
- Re: [multipathtcp] A question related to MPTCP co… Sayee Kompalli Chakravartula
- Re: [multipathtcp] A question related to MPTCP co… Olivier Bonaventure
- Re: [multipathtcp] A question related to MPTCP co… Sayee Kompalli Chakravartula
- Re: [multipathtcp] A question related to MPTCP co… Sargent, Matthew T. (GRC-LCA0)[Peerless Technologies]
- Re: [multipathtcp] A question related to MPTCP co… Sayee Kompalli Chakravartula
- Re: [multipathtcp] A question related to MPTCP co… Olivier Bonaventure
- Re: [multipathtcp] A question related to MPTCP co… Olivier Bonaventure
- Re: [multipathtcp] A question related to MPTCP co… Sayee Kompalli Chakravartula
- Re: [multipathtcp] A question related to MPTCP co… Sargent, Matthew T. (GRC-LCA0)[Peerless Technologies]
- Re: [multipathtcp] A question related to MPTCP co… Sayee Kompalli Chakravartula
- Re: [multipathtcp] A question related to MPTCP co… Olivier Bonaventure
- Re: [multipathtcp] A question related to MPTCP co… Sayee Kompalli Chakravartula
- [multipathtcp] A question related to MPTCP contro… Sayee Kompalli Chakravartula
- Re: [multipathtcp] A question related to MPTCP co… Olivier Bonaventure