User guide

System Administration Guide Network Configuration
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Revised: August 5, 2005 Page 14
receive email from the Internet for local users. DNS is required so the email server can resolve outbound
mail addresses. SNTP is required to get accurate time from an Internet time server (configured on the
Maintenance / Time page).
5.7 Example 2: Secure Firewall with Internal Email Server
Requirements:
The requirements are identical to Example 1 except that instead of using the Bizfon server as the email server,
another host (at 192.168.101.12) on the LAN will be used as the email server.
Configuration:
The configuration is identical to the above except for the following changes:
1. Uncheck the SMTP service from the list of exposed Bizfon services.
2. In the Firewall section of the Network / Configuration / Modify page, add an entry to LAN Addresses
exposed through firewall where:
• WAN Port # is 25.
• Protocol is TCP.
• IP Address is set to the LAN email server, 192.168.101.12
• Local Port # is 25.