Asus GT-AC2900 Faq page 6

VPN tunnels and port numbers
VPN server Port
PPTP TCP 1723, Other 47
OpenVPN UDP 1194
IPSec UDP 500, UDP 4500
The following explains how to set up Port Forwarding on the Root AP. Let's take ASUS router
as the Root AP for example. The ASUS router's WAN IP address is 1.168.x.x and assigned IP
address 192.168.1.100 to your router.
Notes: (1) You must have permission to change settings of the Root AP. If you dont't have,
contact your network administrator.
(2) Setup may be different from different routers. Please refer to the Root AP user
guide for detailed instructions.
Step 1: Log into web GUI of your router and go to the Network Map page to check its WAN IP
address.
Step 2: Set up the Root AP.
Log into the web GUI of Root AP and configure the settings on the Port Forwarding / Virtual
server / NAT server screens as shown below.