Re: [Int-area] Middleboxes to aid the deployment of MPTCP

[Olivier Bonaventure <[e-mail]>]

Joe,

>>>>
>>>> I don't think that TCP-AO is a use case for the proposed converters.
>>>
>>> You don't get to decide that. If you use TCP, then TCP-AO could be
>>> enabled on the client.
>>
>> The converter is not intended to be used for all TCP connections. In
>> the draft we explain how an MPTCP endpoint can bypass the converter if
>> the destination server supports MPTCP. For TCP-AO, my recommendation
>> would be that the default policy of the client would be to never use
>> the converter if TCP-AO is requested by the application.
> 
> How do you know you're using the converter? Is the initial connection to
> that converter? Or does the converter hijack (the latter is the
> implication of the text, AFAICT).

Consider a simple implementation using LD_PRELOAD to overload the 
connect system call on Linux. When the application issues connect, it 
has already set the required socket options that apply for this new 
connection. The converter implementation uses the destination address of 
the connect system call to create the TLV message and sets the TFO 
socket option to send it during its own connect with the converter. If 
the application had requested TFO, then the converter library simply 
uses the regular connect call and everything is fine.


Olivier

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