1

I have an embedded device that is connected by an old dial-up modem to the Internet. I cannot change the embedded device but would like to connect the embedded device to a Linux machine that has an Internet connection. The Linux machine has a free RS232 port that I would like to use. It should offer a virtual modem that behaves just as a normal dial-up modem including a PPP server that allows the embedded device to set up a PPP connection.

If I could make a wish, I would prefer a new device pppN that I could use with normal routing and firewalling.

What is a quick way to do so? What is the best way to do so? Are there better alternatives using RS232 that might require minor changes to the embedded device?

Update: I actually now simply use pppd as described here: http://www.tldp.org/HOWTO/PPP-HOWTO/direct.html

However, I like tcpser and I am pretty sure I will use it for another project sooner then later.

Thanks for your feedback.

Volker
  • 13
  • 1
  • 4
  • Look here : http://www.jagshouse.com/modem.html, I believe your best solution would be to simulate a phone line and then just connect another dial up modem to your Linux machine and connect your embedded device to that. Theoretically it should also be possible to make a modem using a sound card but I haven't found any up to date softmodem implementations on which you'd be able to run ppp on. –  Mar 19 '15 at 11:09
  • [Also related](http://superuser.com/questions/263119/connecting-two-computers-via-modems-rj11). –  Mar 19 '15 at 11:10
  • You may want to look at old software for this. At the time of BBS'es there was a lot of effort in attaching legacy BBS'es to the internet. – Thorbjørn Ravn Andersen Mar 19 '15 at 14:28

2 Answers2

1

I was going to say I didn't know of any such program, but 20 seconds of googling turned up tcpser

symcbean
  • 19,931
  • 1
  • 29
  • 49
0

You can use the JagR software to configure your device from the machine using the external port.
It will allow you ppp connection setup and then a firewall and stable internet connection can be established.
Good luck.

user288118
  • 1