centos 6.5 - pptp vpn

install pptpd(poptop):
	yum -y install pptpd

configure the local & remote ip:
	vi /etc/pptpd.conf
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localip 10.0.0.1
remoteip 10.0.0.100-200
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define the users that have access to the vpn:
	vi /etc/ppp/chap-secrets
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linuxadmin	pptpd	password!1	*
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configure dns server, authentication, protocol, and mtu:
	/etc/ppp/options.pptpd
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ms-dns 8.8.8.8
ms-dns 8.8.4.4
----------------------------------------

restart service:
	service pptpd restart

start pptpd at boot:
	chkconfig pptpd on

add in iptables rules:
	iptables -A INPUT -p gre -j ACCEPT
	iptables -A INPUT -p tcp --dport 1723 -j ACCEPT
	service iptables save
	service iptables restart