Quick Reference Guide

ProSafe Wireless-N VPN Firewall SRXN3205 Reference Manual
7-16 Virtual Private Networking Using SSL
v1.0, January 2010
3. If two or more user, group, or global policies are configured, the most specific policy takes
precedence.
For example, a policy configured for a single IP address takes precedence over a policy configured
for a range of addresses. And a policy that applies to a range of IP addresses takes precedence over
a policy applied to all IP addresses. If two or more IP address ranges are configured, then the
smallest address range takes precedence. Hostnames 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, let’s 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, FTP Servers. The FTP Servers network resource includes the following addresses:
10.0.0.5 – 10.0.0.20 and ftp.company.com, which resolves to 10.0.1.3.
Assuming that no conflicting user or group policies have been configured, if a user attempted 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 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 configured in Policy 2.
Note: The user would not be able to access ftp.company.com using its IP address
10.0.1.3. The VPN firewall policy engine does not perform reverse DNS
lookups.