[   73.180653][  T391] secure_seq: tcpv6 isn: 126469081
[   86.150382][  T472] secure_seq: tcp isn: 3607337074
[   94.210647][  T504] secure_seq: tcpv6 isn: 739538825
[   97.306190][  T504] packetdrill (504) used greatest stack depth: 22456 bytes left