Netgear UTM25EW-100NAS ユーザーズマニュアル

8-32

Virtual Private Networking Using SSL Connections

For example, a policy that is configured for a single IP address takes precedence over a policy that 
is configured for a range of addresses. And a policy that applies to a range of IP addresses takes 
precedence over a policy that is applied to all IP addresses. If two or more IP address ranges are 
configured, then the smallest address range takes precedence. Host names are treated the same as 
individual IP addresses.

Network resources are prioritized just like other address ranges. However, the prioritization is 
based on the individual address or address range, not the entire network resource.

For example, assume the following global policy configuration:

•

Policy 1: A Deny rule has been configured to block all services to the IP address range 
10.0.0.0 – 10.0.0.255.

•

Policy 2: A Deny rule has been configured to block FTP access to 10.0.1.2 – 10.0.1.10.

•

Policy 3: A Permit rule has been configured to allow FTP access to the predefined network 
resource with the name FTP Servers. The FTP Servers network resource includes the 
following addresses: 10.0.0.5 – 10.0.0.20 and the FQDN ftp.company.com, which resolves to 
10.0.1.3.

Assuming that no conflicting user or group policies have been configured, if a user would attempt 
to access:

•

an FTP server at 10.0.0.1, the user would be blocked by Policy 1.

•

an FTP server at 10.0.1.5, the user would be blocked by Policy 2.

•

an FTP server at 10.0.0.10, the user would be granted access by Policy 3. The IP address range 
10.0.0.5 - 10.0.0.20 is more specific than the IP address range that is defined in Policy 1.

•

an FTP server at ftp.company.com, the user would be granted access by Policy 3. A single host 
name is more specific than the IP address range that is configured in Policy 2.

To view the existing policies, follow these steps:

1. Select VPN > SSL VPN from the menu. The SSL VPN s submenu tabs appear, with the 

Policies screen in view. (

 shows some examples.)

Note: The user would not be able to access ftp.company.com using its IP address 

10.0.1.3. The UTM’s policy engine does not perform reverse DNS lookups.