Нужен VPN сервер, что для этого необходимо? help

INPTCP="20 21 22 80 1412 8080 10300 20164 1723 49150"
for i in $INPTCP;
do
echo -n "$i "
$IPT -A INPUT -i $EXTIF -p tcp --dport $i -j ACCEPT
$IPT -A INPUT -i $EXTIF2 -p tcp --dport $i -j ACCEPT
$IPT -A INPUT -i $INTIF1 -p tcp --dport $i -j ACCEPT
$IPT -A INPUT -i $INTIF2 -p tcp --dport $i -j ACCEPT
done
$IPT -A INPUT -p 47 -j ACCEPT

iptables -L | grep 1723
ACCEPT tcp -- anywhere anywhere tcp dpt:1723
ACCEPT tcp -- anywhere anywhere tcp dpt:1723
ACCEPT tcp -- anywhere anywhere tcp dpt:1723
ACCEPT tcp -- anywhere anywhere tcp dpt:1723

iptables -L | grep gre
ACCEPT gre -- anywhere anywhere

809я ошибка с новым chap-secrets.

Apr 9 17:44:06 rimsky pptpd[21372]: CTRL: Client 192.168.1.2 control connection started
Apr 9 17:44:06 rimsky pptpd[21372]: CTRL: Starting call (launching pppd, opening GRE)
Apr 9 17:44:06 rimsky pppd[21373]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Apr 9 17:44:06 rimsky pppd[21373]: The remote system is required to authenticate itself
Apr 9 17:44:06 rimsky pppd[21373]: but I couldn't find any suitable secret (password) for it to use to do so.
Apr 9 17:44:06 rimsky pppd[21373]: (None of the available passwords would let it use an IP address.)
Apr 9 17:44:06 rimsky pptpd[21372]: GRE: read(fd=6,buffer=8059560,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
Apr 9 17:44:06 rimsky pptpd[21372]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Apr 9 17:44:06 rimsky pptpd[21372]: CTRL: Reaping child PPP[21373]
Apr 9 17:44:06 rimsky pptpd[21372]: CTRL: Client 192.168.1.2 control connection finished

cat /etc/ppp/chap-secretscat
login * password