Watchguard Firebox X15 User Manual page 202

Configuring Virtual Private Networks
the devices cannot be made unless the two devices know how to
find each other.
You can use Dynamic DNS if you cannot get a static external IP
address. For more information, see "Registering with the Dynamic
DNS Service" on page 81.
How do I get a static external IP address?
You get the external IP address for your computer or network from
your ISP or a network administrator. Many ISPs use dynamic IP
addresses to make their networks easier to configure and use with
many users. Most ISPs can give you a static IP address as an option.
How do I troubleshoot the connection?
If you can send a ping to the trusted interface of the remote Fire-
box® X Edge and the computers on the remote network, the VPN
tunnel is up. The configuration of the network software or the soft-
ware applications are possible causes of other problems.
Why is ping not working?
If you cannot send a ping the local interface address of the remote
Firebox X Edge, follow these steps:
1
Ping the external address of the remote Firebox X Edge.
For example, at Site A, ping the IP address of Site B. If the ping packet
does not come back, make sure the external network settings of Site B
are correct. (Site B must be configured to respond to ping requests on
that interface.) If the settings are correct, make sure that the computers
at Site B have Internet access. If the computers at site B do not have
Internet access, speak to your ISP or network administrator.
2
If you can ping the external address of each Firebox X Edge, try
to ping a local address in the remote network.
From a computer at Site A, ping the internal interface IP address of the
remote Firebox X Edge. If the VPN tunnel is up, the remote Edge sends
the ping back. If the ping does not come back, make sure the local
configuration is correct. Make sure that the local DHCP address ranges
for the two networks connected by the VPN tunnel do not use any of the
same IP addresses. The two networks connected by the tunnel must not
use the same IP addresses.
How do I set up more than the number of allowable
VPNs on my Firebox X Edge?
The number of VPN tunnels that you can create on your Firebox X
Edge is set by the Edge model you have. You can purchase a model
upgrade for your Edge to make more VPN tunnels. You can purchase
188 WatchGuard Firebox X Edge