hello everyone
please help me configure PPTP server behind NAT, I can connect to it
but have no internet access
sorry for long post. I tried make it detailed
I have openwrt router (192.168.98.1) which connects to internet trough PPPoE and gets real IP
when I configured PPTP server on it everything worked FINE.
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now I uninstalled PPTP server from that router (192.168.98.1)
and configured it on NETBOOK with single lan port on it
running OpenWRT x64 (192.168.98.200)
here is how looks configuration of that single port
[/etc/config/pptpd] on NETBOOK (192.168.98.200)
config service 'pptpd'
option 'enabled' '1'
option 'localip' '192.168.98.200'
option 'remoteip' '192.168.98.20-30'
config 'login'
option 'username' mydevice'
option 'password' 'devicepassword'
[/etc/firewall.user] on NETBOOK (192.168.98.200) and router (192.168.98.1)
# Allow all traffic in and out of the ppp interface. No reason to specify nets.
iptables -A input_rule -i ppp+ -j ACCEPT
iptables -A output_rule -o ppp+ -j ACCEPT
# This rule will allow traffic towards internet
iptables -A forwarding_rule -i ppp+ -j ACCEPT
iptables -A forwarding_rule -o ppp+ -j ACCEPT
added this to
[/etc/config/firewall] on NETBOOK (192.168.98.200) and router (192.168.98.1)
config rule
option target 'ACCEPT'
option _name 'pptp'
option src 'wan'
option proto 'tcp'
option dest_port '1723'
config rule
option target 'ACCEPT'
option _name 'gre'
option src 'wan'
option proto '47'
also I installed on NETBOOK (192.168.98.200) and router (192.168.98.1)
kmod-nf-nathelper-extra
and created /etc/sysctl.d/20-nf-conntrack-helper.conf
with this content
net.netfilter.nf_conntrack_helper = 1
//
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now I can connect to PPTP server
but only NETBOOK (192.168.98.200) is accessible
I can not get to 192.168.98.1 nor to internet
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after that I even tried to add port forwarding rules to openwrt router (192.168.98.1)
It did not help too 
//
I am new to linux and routing
I suppose it maybe need some routing rules added
thank you
and sorry for long post 