GB-750 Firewall Appliance Product Guide20
Troubleshooting Q & A
1. Why are the amber LEDs on the back not lighting up?
This indicates that you do not have network connectivity. You may have
selected the wrong network connection type. Check the Network Informa-
tion screen to ensure the appropriate connection type is selected. If you have
selected one of the specic settings, reset to AUTO, the factory setting.
2. Why can't all hosts behind the firewall reach the Internet?
This is usually a routing problem. The Traceroute facility can be very useful in
debugging routing problems. Check for these problems:
• Are the hosts that can’t reach the Internet on a different network
subnet?
• Have you added a static route to the GB-750 to tell it which router is
used to reach the problem network? Have you set the router’s default
route to be the GB-750? Have you set the default route for hosts on
the problem network to be the router?
• Is the wrong IP address assigned? All network interfaces on the GB-
750 must be on different logical networks.
• Is the default route assigned incorrectly? The default route must
always be on the same subnet as the network interface of the host
(this is true for all hosts, not just the GTA Firewall). For a GB-750, the
default route must be an IP address on the network which is attached
to the External Network interface.
Exception
When using PPP, PPTP or PPPoE, the default route is not necessarily
on the same subnet. The route is assigned by your PPP provider.
3. Why can't one host behind the firewall reach the Internet?
This indicates that the default route is assigned incorrectly (or not at all) to
hosts on the Protected or Private Service networks. All hosts protected by the
GB-750 must use the IP address of the GB-750’s network interface for the
respective network. Hosts that reside behind routers or other gateways on
these networks generally use the IP address of the gateway or router.
4. Why can't I access the Web interface from the Protected Network?
The default Remote Access lter set is generated from the conguration
parameters entered in the Network Information screen. It is possible that the
GB-750’s Protected Network interface is on a different subnet from the remote
host. Check the Remote Access lter for the Web interface; it may need to be
adjusted.
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