> On 25 Feb 2016, at 12:27 AM, Nick Cutting <[email protected]> wrote:
> 

> So the MSS will never change while the session stays up, however the IP MTU 
> may fluctuate, but is always aware of the upper layers maximum segment size ? 
> (and the lower layers link mtu)

It depends what you mean by this.

If you are asking whether the sender and receiver exchange MSS information 
after TCP establishment, I would say no.

However, if I understand this correctly, both sender and receiver will have 
their own internal representation of MTU and MSS (however this is done) and 
they will track this based on the returned PMTUD messages how to adjust the 
size of the packets that can be sent to the destination.

-- Andrew

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