Some middleboxes try to "understand" TCP, and by that I mean they strip out TCP options [0]. Ditto with IP [1]. Options are just not a reliable mechanism for cr

Some middleboxes try to "understand" TCP, and by that I mean they strip out TCP options [0]. Ditto with IP [1]. Options are just not a reliable mechanism for critical protocol features, these days. [0] http://conferences.sigcomm.org/imc/2011/docs/p181.pdf http://conferences.sigcomm.org/imc/2011/docs/p181.pdf [1] https://www2.eecs.berkeley.edu/Pubs/TechRpts/2005/EECS-2005-24.pdf https://www2.eecs.berkeley.edu/Pubs/TechRpts/2005/EECS-2005-...