Linux Dial in Server Setup

Here is tutorial for build a dial in server with Linux machine:
1. Build you network plan configuration
[dial in server : 192.169.169.1]<-- PSTN Tel Line-->[Client 192.169.169.2]

2. Create an account to in dial in server
Host : 192.169.169.1
Account : dialin
Password/Secret : dialin

3. Setup dial in server as a gateway
[root@server]# echo 1 > /proc/sys/net/ipv4/ip_forward
[root@server]# ipchains -A forward -j MASQ

4. Plug in you modem in your dial in server

5. Prepare some need package on server
[root@server]# rpm -qa | grep pppd
[root@server]# rpm -qa | grep mgetty

6. Edit /etc/inittab , add these line (ttyS1 for com1 port):
[root@server]# vi /etc/inittab
##------------------
s1:2345:respawn:/sbin/mgetty ttyS1
##------------------

7. Edit /etc/ppp/options, and add these line
[root@server]# vi /etc/ppp/options
##------------------
auth -chap +pap login modem crtscts debug proxyarp lock
ms-dns 192.169.169.1
##------------------


8. Edit /etc/ppp/options.ttyS1
[root@server]# vi /etc/ppp/options.ttyS1
##------------------
##server:host
192.169.169.1:192.169.169.2
##------------------

9. Edit /etc/mgetty+sendfax/login.config and add these line :

[root@server]# vi /etc/mgetty+sendfax/login.config
##------------------
/AutoPPP/ - a_ppp /usr/sbin/pppd
##------------------


10. edit /etc/ppp/pap-secrets :

[root@server]# vi /etc/ppp/pap-secrets
##------------------
# Secrets for authentication using PAP
# client server secret IP addresses
dialin * dialin 192.169.169.2
##------------------

11. Tell init about the changes
init q

12. You are ready to dial in