Post #1548783

@Karcsesz hmm. Setting the mss clamp (via mangle or otherwise) makes sense at least, as it signals that return packets payload should not exceed the mss. This is normally a non-issue since most hosts will not try and send/route packets >1500 over the internet, but I guess Microsoft is opportunistically trying to optimize the connection with jumbo packets (and failing badly). If it worked, it'd make a lot of sense (4200 bytes seems suspiciously close to a quarter of a 16k disk read), but not great when it fails.