Post BAdrg3o73rKSn6UAhU by niconiconi@mk.absturztau.be
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 (DIR) Post #BAdrg3o73rKSn6UAhU by niconiconi@mk.absturztau.be
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       @phooky@hexa.club Some protocols already do in-band Path MTU Discovery by sending progressively larger application data payload to work around ICMP blackholes. So it's arguably some ICMP over TLS at play.