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ZyWALL 10/50 Internet Security Gateway
Example Firewall Rules 16-1
Chapter 16
Example Firewall Rules
This chapter gives examples for configuring various rules for WAN to LAN and LAN to WAN.
16.1 Examples
Whenever you open a hole in the firewall to forward a service from the Internet to the local network, and
NAT is also enabled, you may have to also configure a server behind NAT using SMT menu 15.2. Please see
the NAT chapter.
16.1.1 Example 1: Firewall Rule To Allow Web Service From The Internet
Let’s say you have one server on the local network, with an IP of 10.100.1.2, supporting FTP, HTTP, Telnet
and mail services. The only traffic allowed from the Internet is web service. You want to be able to forward
all traffic initiated from the local network. You want to know who accesses your server and send e-mail alerts
when this happens. Assume, for example, your mail account is user@zyxel.com. Another network
administrator has an e-mail address of user2@zyxel.com. Here are the steps you would follow.