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Re: Re: Pregunta Ras

Por si te sirve:

Debian PPP dialin and callback server
First of all sorry for my english. I decided to write this tutorial to help 
people to configre their linux machine to run PPP dialin and callback 
services. First time I was working on this for about 12 hours even using 
other tutorials, but they had small misconfigurations, so using all the 
material I found on the web finally I got what I want.
Software (pre configuration)
I was using debian OS:
debian:~# uname -a
 Linux debian 2.2.20 #1 Sat Apr 20 11:45:28 EST 2002 i586 unknown
NOTICE: You need to be superuser for now!
When I started configuring and reading manuals, I tested if there is ppp 
package installed on my computer:
debian:~# whereis pppd
It means, where is no pppd package installed on my computer. So I installed 
debian:~# apt-get install ppp
When I continued reading manuals and found that I need mgetty package too. 
Again I tested if there is package mgetty on my computer:
debian:~# whereis mgetty
Again there was no this package so I installed it:
debian:~# apt-get install mgetty
Now all packages are installed on my computer for PPP dialin and callback 
Hardware (modem)
I have external modem connected to my computer on COM1 it means /dev/ttyS0. 
You can have COM2 so it's on /dev/ttyS1. You have to be sure that your modem 
is supported by LINUX OS, because my tutorial doesn't cover this topic. No 
futher configuration is needed for modem and we are ready for configuring our 
Configuration (dialin)
Here are steps that I did configuring my system.
1. Create new group ppp, for this you need to edit file /etc/group and add 
this line on the end of file:
2. Create new system user for dialin connection pppuser: Simple create new 
system user and when using shell command vipw change line of user pppuser to 
3. Create new file /usr/sbin/ppplogin:
 # PPP login script
 mesg n
 stty -echo
 exec /usr/sbin/pppd -detach modem debug crtscts
4. Set access attributes for this file:
debian:~# chmod 750 /usr/sbin/ppplogin
 debian:~# chown root:ppp /usr/sbin/ppplogin
5. Set access attributes for /etc/ppp directory:
debian:~# chmod 775 /etc/ppp
 debian:~# chown root:root -R /etc/ppp
6. Set access attributes for /usr/sbin/pppd:
debian:~# chmod 750 /usr/sbin/pppd
 debian:~# chmod u+s /usr/sbin/pppd
7. Add line at the end of file /etc/inittab if you are using COM1:
S0:2345:respawn:/sbin/mgetty ttyS0
or this line if you are using COM2:
S1:2345:respawn:/sbin/mgetty ttyS1
8. Restart init. This enables the ttyS0 line to accept incoming connections:
debian:~# init q
9. Now add line at the end of file /etc/mgetty/login.config:
/AutoPPP/ - - /usr/sbin/pppd auth +pap -chap login -detach
comment all other lines on this file.
10. Create file /etc/ppp/options.ttyS0 if you are using COM1 or 
file /etc/ppp.options.ttyS1 if you are using COM2:
On first line there are two IP addresses. First assigned for server on 
connection and second to client. You can change them according to your IP 
numbering scheme.
11. Now try dialing to the server from a client. For this if you are using MS 
windows, click dial up networking and then select new connection and fill out 
various fields. Login as pppuser with password and verify whether your dialin 
server is working perfectly. Check the connection by pinging the server from 
client. Also you can verify the ip address assigned to client by typing 
winipcfg on command prompt. 
Configuration (callback)
Actually there is just small changes to start callback service.
1. Create an empty file /etc/mgetty/callback.conf.
2. Add line at the end of file /etc/mgetty/login.config:
pppuserb - - /usr/sbin/callback -S callback_number
You should change callback_number to your client phone number.
That's all for callback service. Now it's working. And you need only client 
Configuration (callback client)
As client I use Windows XP professional, but the same configuration is O.K. 
for other MS Windows versions.
1. Run your control panel, and open Phone and modem options. On modems tab 
select one that you use for connecting to your callback service and press 
Properties. Now on advanced tab you see extra initialization commands. Enter 
2. Now create file callback.scp anywhere on your filesystem:
proc main
 waitfor "ogin: "
 transmit $USERID
 transmit "b^M"
 waitfor "ogin: "
 transmit $USERID
 transmit "^M"
 waitfor "assword: "
 transmit $PASSWORD
 transmit "^M"
3. Now create new connection as you do using usual ISP. For login use 
username 'pppuser' and password. Now go on new connections properties, then 
security tab, check the box use script and browse to your created file 
callback.scp. That's all now you can just connect to your callback server. 
After few seconds it will hang up your connection and redial. For your 
computer and for callback server will be assigned IP addresses. You can try 
to ping it. Congratulation now you have network connection with callback 
NOTICE! I don't cover topics about making your client to reach the internet 
access that callback server may have.
If you find out some problems related to my tutorial please inform me about 
this using e-mail. According to your assistance I will make corrections to 
this tutorial and use this troubleshooting section for right way.
About author
My name is Tomas Vilda, I'm living in Lithuania, city Vilnius. I work as 
system administrator-programmer on enterprise of J. Denapas "TIGBIS". My 
e-mail webmaster@stilius.net. I have wonderful girlfriend Inga that I love so 
much. And I want to thank her for making me do something else not just 
sitting by computer.
This tutorial was last update on 2003 11 14. You can allways find newest 
version on here
This document is copyrighted to Tomas Vilda. You can use it in all ways, but 
don't change this section and allways include it.

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