ZyXEL Communications P-793H v2 Support Notes page 34

If your P-793H v2 is capable of VPN, you can find the VPN options in
Advanced>VPN tab.
For configuring a 'box-to-box VPN', there are some tips:
1. If there is a NAT router running in the front of P-793H v2, please make
sure the NAT router supports to pass through IPSec.
In NAT case (either run on the frond end router, or in P-793H v2 VPN
2.
box), only IPSec ESP tunneling mode is supported since NAT againsts
AH mode.
Source IP/Destination IPPlease do not number the LANs (local and
3.
remote) using the same exact range of private IP addresses. This will
make VPN destination addresses and the local LAN addresses are
indistinguishable, and VPN will not work.
4. Secure Gateway IP Address This must be a public, routable IP
address, private IP is not allowed. That means it can not be in the
10.x.x.x subnet, the 192.168.x.x subnet, nor in the range 172.16.0.0 -
172.31.255.255 (these address ranges are reserved by internet
standard for private LAN numberings behind NAT devices). It is usually
a static IP so that we can pre-configure it in P-793H v2 for making VPN
connections. If it is a dynamic IP given by ISP, you still can configure
this IP address after the remote P-793H v2 is on-line and its WAN IP is
available from ISP.
5. Does P-793H v2 support dynamic secure gateway IP?
If the remote VPN gateways use dynamic IP, we enter 0.0.0.0 as the Secure
Gateway IP Address in P-793H v2. In this case, the VPN connection can only
be initiated from dynamic side to fixed side in order to update its dynamic IP to
the fixed side. However, if both gateways use dynamic IP addresses, it is no
way to establish VPN connection at all.
6. What VPN gateway that has been tested with P-793H v2 successfully?
We have tested P-793H v2 successfully with the following third party VPN
gateways.
Cisco 1720 Router, IOS 12.2(2)XH, IP/DSL/FW/IDS PLUS IPSEC
3DES
NetScreen 5, ScreenOS 2.6.0r6
SonicWALL SOHO 2
WatchGuard Firebox II
ZyXEL P-793H v2
Avaya VPN
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P-793H v 2 Support Notes
33