nullmodem connection

Forum: Other Help Topics
Topic: nullmodem connection
started by: steve196

Posted by steve196 on Mar. 09 2007,09:36

Does anyone know, how to transfer files to and from a dsl system via a nullmodem connection?
Thanks!

Posted by curaga on Mar. 09 2007,11:24

With linux of with Win$? Here are some ways:

- PPP and telnet/ssh over it (works with both)
- PPP and a samba share on DSL (works with both)
- PPP and a NFS or NBD share on either DSL or the other linux box

Posted by steve196 on Mar. 09 2007,15:50

Thank you!
How do i tell the system, that the serial cable exists and is to be used?

Posted by curaga on Mar. 11 2007,16:04

It doesn't need to know that..
If it's in the first serial port, then the data device is /dev/ttyS0
You might want to read the < PPP howto >
but basicly it's just getting pppd to both comps, giving ip addresses to both (192.168.0.1 and 192.168.0.2 are ok) and then just
sudo pppd -detach crtscts lock <local IP>:<remote IP> /dev/ttyS0 38400 &

which would be on the first machine
sudo pppd -detach crtscts lock 192.168.0.1:192.168.0.2 /dev/ttyS0 38400 &

and on the second machine
sudo pppd -detach crtscts lock 192.168.0.2:192.168.0.1 /dev/ttyS0 38400 &

Now you have a PPP link going, and you can test it by ping'in the other comp. Then all sharing will work over it, even an internet connection, here's how to share net:
(either normal or net-sharing connection, not both at once)

On the machine with internet:
sudo pppd -detach crtscts lock proxyarp <local IP>:<remote IP> /dev/ttyS0 38400 &

And on the machine without internet:
sudo pppd -detach crtscts lock defaultroute <local IP>:<remote IP> /dev/ttyS0 38400 &

Posted by steve196 on Mar. 12 2007,11:33

Thank you!
I have found the site and used it to successfully make an ssh connection to the laptop. Internet connection does not work as described.