ptb6: conn [::1].1212 <-> [::1].49170
before-PTB : t_state=5 t_maxseg=14336 t_maxopd=16324 t_rttupdated=41 snd_ssthresh=28672 snd_cwnd=28676
ptb6: injected ICMPv6 PTB mtu=60 quoting ::1.1212 -> ::1.49170
after-PTB  : t_state=5 t_maxseg=14336 t_maxopd=16324 t_rttupdated=41 snd_ssthresh=28672 snd_cwnd=28676
ptb6: -x given; sleeping so you can inspect