Assuming you mean ssh tunneling and the ipython laptop is running on port 1234 on machine B:
A B , A SSH:
ssh -L 9999:machineB.com:1234 -N machineA.com
ssh machineA.com (-N) A 9999 ssh B 1234
, A B ssh, . - machineA, machineA machineB. :
ssh -L 9999:localhost:8888 machineA.com ssh -L 8888:localhost:1234 -N machineB.com
ssh machineA.com A - 9999 ssh 8888. "ssh -L 8888: localhost: 1234 -N machineB. ". machine888888 machine 1234 ( iPython).
, , - 9999. ssh machineA, localhost: 8888, ssh machineB, localhost: 1234.
, machineA machineB ( / ), .
, ssh tunneling https://superuser.com/questions/96489/ssh-tunnel-via-multiple-hops