isn

xprobe package sources code

Successive client-choosen ISNs upon telnet connect:

1474526322
1522383322
1542328371
1561575407
1588181513
...

then, connect to client-machine, now server ISN:

1743032657
1772878939
1784206170


swicth back as client:

1803144879
1843311757
1879976257


and server again:

1897176627