Re: [multipathtcp] High-level design decisions /architecture

[Joe Touch <[e-mail]>]

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Mark Handley wrote:
> 2009/11/2 William Herrin <[e-mail]>:
>> Consider the following scenario:
>>
>> Host A comes online with 1.2.3.4.
>> Host A requests a new TCP connection to 5.6.7.8.
>> Established with host B at 5.6.7.8.
>> Host B adds 8.7.6.5
>> Host B removes 5.6.7.8
>> Host C comes online with 5.6.7.8.
>> Host A requests a new TCP connection to 5.6.7.8.
>>
>> Which host does A connect to?
> 
> I'm not sure I see the problem.
> 
> When host B removes 5.6.7.8, that address is removed from that
> connection only.  It has no relation with any other connections,
> ongoing or future.  If A has any other connections with 5.6.7.8, they
> are unaffected (after all, 5.6.7.8 may be a NAT with several hosts
> behind it) unless they also explicitly remove the address.
> 
> When A requests a new TCP connection to 5.6.7.8, that's what A's app
> specified at that moment in the connect call, and that's the address
> the SYN will be sent to.  No previous behaviour for any other
> connection affects that.

How do you know whether 5.6.7.8 is the same place as the first
connection, or a new place? Don't you need to figure that out to know
whether you end up with new capacity, or need to share capacity?

Joe
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