User`s guide

System Administrator’s Guide – Release 7.2.3.x
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Revised: September 1, 2010
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2. In the Firewall section of the Network / Configuration / Modify page, change the Allworx Services (ports)
exposed through DMZ so that only SMTP, DNS, and SNTP are checked. SMTP is required to 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 3
rd
-Party Email Server
Requirements
The requirements are identical to Example 1 except that instead of using the Allworx
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 previous example except for the following changes:
1. Uncheck the SMTP service from the list of exposed Allworx
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.