ssh tunnel doesn't work

Question

Even though tunnelling using ssh is a well discussed topic in internet, I couldn't make my setup proper. This is what the problem statement I have

-> I have two servers A and B. -> I am trying to create a tunnel from A to B

-> In BI have echo server which is listening on port 34567

-> In AI have executed the command ssh -L 4444:10.106.251.90:34567 127.0.0.1

-> Netstat shows as follows

~ # netstat -na | grep 4444 tcp 0 0 127.0.0.1:4444 0.0.0.0:* LISTEN tcp 0 0 ::1:4444 :::* LISTEN -> In BI tried to check netstat -na | grep 4444 netstat -na | grep 4444 but there was no reference of it

-> In AI have echo client which writes into 127.0.0.1:4444

-> If I execute client in A, it doesn't forward. Instead it gives some 0 length string always

Is there any thing that I am missing here ?

Thanks ~S

Answer 1

Try using

ssh -L 4444:127.0.0.1:34567 user@10.106.251.90

This will open port 4444 on your local machine, forwarding packets to port 34567 of the remote machine.

# using on local
telnet 127.0.0.1 4444

# is the same as

# on remote
telnet 127.0.0.1 34567