Today I was trying ssh tunneling between my desktop machine and a
raspberry pi. On the desktop machine I entered the following:
ssh user@192.168.1.4 -L 3000:192.168.1.4:1234
I then gave it my password then started rtl_tcp :
$ rtl_tcp -a 192.168.1.4 -p 1234
From my desktop machine I connected to 127.0.0.1:3000 and the
connection was successful.
$ nrsc5 -H 127.0.0.1:1234 91.9 0
IT worked as expected.
Then I logged out and tried again, only instead of the ip address I
entered the name of hostname.
$ ssh
user@ladmo.asuscomm.com -L 1234:ladmo.asuscomm.com:1234
Then I started rtl_tcp just like I did before.
From the desktop machine I tried the same command again:
$ nrsc5 -H 127.0.0.1:1234 91.9 0
This time I got an error message. I checked the terminal window where I
logged into the raspberry pi and saw this:
channel 3: open failed: connect failed: Connection refused
I logged out and tried again, only with the -v option:
$ ssh -v
user@machine.domain.com -L 1234:machine.domain.com:1234
I tried again:
$ rtl_tcp -a 192.168.1.4 -p 1234
This time I got a little more information:
debug1: channel 3: free: direct-tcpip: listening port 3000 for
machine.domain.com port 1234, connect from 127.0.0.1 port 56318 to
127.0.0.1 port 3000, nchannels 4
I tried one more time using the IP address assigned by my ISP. It
didn't work and I got the same message as above.
Does anyone know why it doesn't work when I don't use the local IP
address? The router is configured to forward incoming connections on
port 22 to the raspberry pi.
Thanks
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