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About your Internet Router
Firewall Protection
The firewall protection provided by the Internet Router is an intrinsic side effect
of IP sharing. All users on the LAN share a single external IP address. From
the external viewpoint, there is no network, only a single device.
For internal users, the Internet Router acts as a "transparent proxy server",
translating the multiple internal IP addresses into a single external IP address.
For external requests, any attempt to connect to local resources are blocked. The
Internet Router will not "reverse translate" from a global IP address to a local IP
address.
This type of "natural" firewall provides an impregnable barrier against malicious
attacks.
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