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Hey, that's just a small part of the story.
MSS in the SYN does not allow to detect a reduced MTU somewhere along the path.

In this case, the first segment that the source will send will be discarded by the router at the head of the reduced MTU link, because it's too big _and_ it carries the "don't fragment" bit in the IP header.

That router will send and ICMP er... "fragmentation needed" to the source who will then adjust its MTU. (And cache it for subsequent connections!)


Hi Martin,

cool, I wasnt aware of that part! Great, thanks for commenting!

Kind regards,

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