socat/telnet connection error to n900 - maemo.org

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impeham	2015-01-13 , 21:26
Posts: 669 \| Thanked: 433 times \| Joined on May 2010	#1

I am trying to test access to ports on the n900 device. Running the following command:

socat - TCP-LISTEN:30,crlf

After that, I am able to use the following commands successfully and connect:
Telnet
Open localhost 30

But if I try to telnet from another machine on the same network, I get connection error.

Is there something I should change on the device to make this port accessible from the outside?

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reinob	2015-01-14 , 08:38
Posts: 1,808 \| Thanked: 4,272 times \| Joined on Feb 2011 @ Germany	#2

@impeham,

AFAIK TCP-LISTEN only binds to localhost (127.0.0.1). You'd need something like:

Code:

socat - TCP-LISTEN:30,bind=192.168.2.2,crlf

Replace "192.168.2.2" with a suitable address.
Note that I haven't tested this, but it "should" work

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impeham	2015-01-14 , 13:58
Posts: 669 \| Thanked: 433 times \| Joined on May 2010	#3

Originally Posted by reinob

@impeham,

AFAIK TCP-LISTEN only binds to localhost (127.0.0.1). You'd need something like:
Code:
socat - TCP-LISTEN:30,bind=192.168.2.2,crlf
Replace "192.168.2.2" with a suitable address.
Note that I haven't tested this, but it "should" work

Thanks - tries it and getting an error:
"Cannot assign requested address"

i used the external ip address (the one i am getting from the cell 3G provider - might this error be related to a NAT of the provider?)

will test this in internal network also.

Last edited by impeham; 2015-01-14 at 14:16.

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reinob	2015-01-14 , 14:30
Posts: 1,808 \| Thanked: 4,272 times \| Joined on Feb 2011 @ Germany	#4

Originally Posted by impeham

Thanks - tries it and getting an error:
"Cannot assign requested address"

i used the external ip address (the one i am getting from the cell 3G provider - might this error be related to a NAT of the provider?)

will test this in internal network also.

With "suitable address" I meant one you can actually control. You most likely cannot bind to a 3G address (which may not even be a routable address). Try with your LAN address and see if that does it.