Novell LINUX ENTERPRISE SERVER 11 - ADMINISTRATION Administration Manual page 446

tion "Configuring the Firewall with YaST" (Chapter 15, Masquerading and Firewalls,
↑Security Guide). Its configuration file can be found in /etc/sysconfig/
SuSEfirewall2. The configuration file consists of well-documented entries. To set
a transparent proxy, you must configure several firewall options:
• Device pointing to the Internet: FW_DEV_EXT="eth1"
• Device pointing to the network: FW_DEV_INT="eth0"
Define ports and services (see /etc/services) on the firewall that are accessed
from untrusted (external) networks such as the Internet. In this example, only Web
services are offered to the outside:
FW_SERVICES_EXT_TCP="www"
Define ports or services (see /etc/services) on the firewall that are accessed from
the secure (internal) network, both via TCP and UDP:
FW_SERVICES_INT_TCP="domain www 3128"
FW_SERVICES_INT_UDP="domain"
This allows accessing Web services and Squid (whose default port is 3128). The service
"domain" stands for DNS (domain name service). This service is commonly used.
Otherwise, simply take it out of the above entries and set the following option to no:
FW_SERVICE_DNS="yes"
The most important option is option number 15:
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