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Current HOWTO: Serial-Laplink-HOWTO


On the client side

3. On the client side

After having configured the server, the client is easy. The "/etc/ppp/options" file has a single entry:

#/etc/ppp/options
lock
  

The serial port on my client is "/dev/ttyS0" (COM1), so I also have to create a "/etc/ppp/options.ttyS0" file:

#/etc/ppp/options.ttyS0
115200
crtscts
local
user zaphod
noauth
  

Only a few new options in this file. Note that the speed on server and client has to be the same (here it is 115200). With "user zaphod" the client user name is specified. This user name has to correspond to an entry in the "/etc/ppp/pap-secrets" file of the client and has to be a valid user name on the server. The "noauth" option specifies that the peer (server) does not have to authenticate itself to the client.

The last bit: setting the client name (user name) and its secret (password) in the "/etc/ppp/pap-secrets" file:

#/etc/ppp/pap-secrets
# Secrets for authentication using PAP
# client                 server                  secret                IP addresses
zaphod                   *                       gargleBlaster
  

So user "zaphod" uses a password "gargleBlaster", which should get him into the system. Note that these files contain sensitive information, make sure you set the permissions on them correctly.

3.1. Start the client

On the command line, type:

/usr/sbin/pppd /dev/ttyS0 nodetach
   

3.2. Connecting to an MS Windows server

What if you want to make a connection to a Windows server? Again we'll need the "connect" option and a chat script. Add the following line to your "/etc/ppp/options.ttyS0" file:

connect chat -v -f /etc/ppp/scripts/winserver.chat
   

Also create the chat script "/etc/ppp/script/winserver.chat":

TIMEOUT 10
'' CLIENT\c
   

This makes the client send the "CLIENT" string before trying to start the PPP connection.

3.3. Setting up an MS Windows (95) client

To connect to the server using windows, you use the Direct Cable Connection program, and set it up as "guest". In order for the windows client to connect at full speed (or at all), you will have to change the communication speed of direct cable connection. To do this, go to Control Panel->System->Device Manager->Modems and select the serial cable. Proceed to the 'modem' option and select a maximum speed of 115200 or whatever your linux computer is set to. Now, it is important that you reboot at this stage, or it WILL NOT WORK (at least with Microsoft windows 95 version A), I am not sure about others.

3.4. Oddly enough...

Oddly enough I created a Linux server that has to connect to both Linux and Windows computers, so I found myself with the odd situation of having to setup both Linux systems such that they would connect to Windows servers and clients!


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