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724-746-5500 | blackbox.com
Page 128
724-746-5500 | blackbox.com
Chapter 9: Common Configuration Examples
The rate limit for network control and voice is 0 kbps because guests are not permitted to run any applications that would
generate network control traffic or use VoIP applications. In this example, guests are expected to use cell phones or other phones
provided for them. (If you want to provide VoIP for guests, then you must enable the SIP ALG, add another rule to the firewall
policy permitting SIP traffic, and set the rate limit for voice at 128 kbps.)
Firewall Policy
You create a firewall policy that permits outgoing HTTP and HTTPS traffic from within the corporate network to the public
network but not to the corporate network itself. When applying the policy to a user profile, you apply a default action that denies
all incoming traffic and all other unspecified types of outgoing traffic.
Address Objects
To make address objects for use in firewall rules to block traffic to private IP address space in the internal network, click
Configuration > Advanced Configuration > Network Objects > IP Objects/Host Names > New, enter the following, and then click
Apply:
Network: (select)
Object Name: 10.0.0.0/8
In the IP Entry field, enter 10.0.0.0 for the IP address, 255.0.0.0 for the netmask, choose Global for the type, enter a useful
description such as Deny RFC 1918 (private addresses), and then click Apply.
To save the address and close the dialog box, click “Save.”
Repeat the above to create two more address objects, one for 172.16.0.0/12 (IP address = 172.16.0.0; netmask = 255.240.0.0)
and another for 192.168.0.0/16 (IP address = 192.168.0.0; netmask = 255.255.0.0).
Custom Service
To make a custom service for NAT-T (NAT Traversal) to permit IKE traffic when traversing a NAT device, click Configuration >
Advanced Configuration > Network Objects > Network Services > New, enter the following, and then click Save:
Name: NAT-T
Description: NAT Traversal
IP Protocol: UDP (17)
Port Number: 4500
Service Idle Timeout: 1800
ALG Type: (leave blank)
Firewall Policy Rules
To create an IP firewall policy to control outgoing traffic, click Configuration > Advanced Configuration > Security Policies > IP
Policies > New, and enter the following:
Policy Name: guest-IP-policy-from-access
Description: Allow guests to access the public network
To add rules to permit DHCP, DNS, HTTP, HTTPS, IKE, and NAT-T to the public network while denying any type of traffic to the
internal network, enter the following (CTRL-click to select multiple services):