CentOS 5

kernel-2.6.18-8.el5

ppp-2.4.4-1.el5

Kernel version 2.6.15 or above has MPPE built-in which is required for MSCHAPv2. CentOS 5 kernel version is 2.6.18 that means you do not need to install the MPPE module. CentOS 5 comes with ppp-2.4.4-1.el5 and it is MPPE support enabled.

1. Run the command below to test if your kernel supports MPPE and you should get a return an “ok”: -

modprobe ppp-compress-18 && echo ok

2. Download the RPM file pptpd-1.3.4-1.rhel5.1.i386.rpm from: -

http://poptop.sourceforge.net/yum/stable/packages/

3. Install the RPM by running this command: -

rpm -ivh pptpd-1.3.4-1.rhel5.1.i386.rpm

4. Change the following file /etc/ppp/options.pptpd as below: -

name pptpd

refuse-pap

refuse-chap

refuse-mschap

require-mschap-v2

require-mppe-128

proxyarp

lock

nobsdcomp

novj

novjccomp

nologfd

5. Change the following file /etc/pptpd.conf as below: -

option /etc/ppp/options.pptpd

logwtmp

localip 192.168.2.1

remoteip 192.168.2.11-15

6. Add the following username (johndie) and password (passwrd) in /etc/ppp/chap-secrets as below: -

# Secrets for authentication using CHAP

# client server secret IP addresses

johndoe pptpd passwrd *

7. Run the following command to enable the pptpd to start automatically in runlevel 3 and 5 as below: -

chkconfig --level 35 pptpd on

8. Now, you can start the pptpd service as below: -

service pptpd start

9. For pptpd to work, the packet forwarding must be enabled. Edit /etc/sysctl.conf and change the line to below: -

net.ipv4.ip_forward = 1

10. To enable it immediately, run the following command below: -

sysctl -p