PPTP from Proxmox

[adambenk]

Hi everyone!

Here is my configuration.
1 Proxmox host with 1 VM, host is behind a router.

PROXMOX:
Datacenter - Firewall configuration:
IN ACCEPT TCP 8006
IN ACCEPT SSH
IN ACCEPT PING
IN DROP
Options: input policy: DROP
output policy: ACCEPT


VM: OS windows 7Pro
Firewall configuration:
IN ACCEPT RDP
IN ACCEPT PING
IN DROP
Options: input policy: DROP
output policy: ACCEPT

I want to make a PPTP vpn connection to the internet from the VM.
If FIREWALL on Datacenter is DISABLED (firewall - options - firewall=no) VPN is working great.
If FIREWALL on Datacenter is ENABLED, vpn won't connect. Error 806: GRE protocol is blocked.

Protocol forward (47) on Proxmox (how?) or someting else?

Please help!!!
Thank You

 

[Richard]

If FIREWALL on Datacenter is ENABLED, vpn won't connect. Error 806: GRE protocol is blocked.

Protocol forward (47) on Proxmox (how?) or someting else?

Set GRE protocol (47) to ACCEPT for both in and out.

 

[adambenk]

It's WORKING !!!!!!!!!
It was enough only:
IN ACCEPT GRE - in VM Firewall.

Thanks Richard !!

 

[adambenk]

Completion:

The complete solution is:
IN ACCEPT GRE - in VM Firewall
and
modprobe nf_conntrack_proto_gre

Thanks again!