PLANET CS-1000 - Manual (Page 37)

Multi-Homing Security Gateway User’s Manual
Remove Dynamic DNS
Step 1. Find the item you want to change and click Remove.
Step 2. A confirmation pop-up box will appear, click OK to delete the settings or click Cancel to discard
changes.
3.1.10 Host Table
The Multi-Homing Security Gateway’s Administrator may use the Host Table function to make the
Multi-Homing Security Gateway act as a DNS Server for the LAN and DMZ network. All DNS requests to a
specific Domain Name will be routed to the Multi-Homing Security Gateway’s IP address. For example, let’s
say an organization has their mail server (i.e., mail.planet.com.tw) in the DMZ network (i.e. 192.168.10.10).
The outside Internet world may access the mail server of the organization easily by its domain name,
providing that the Administrator has set up Virtual Server or Mapped IP settings correctly. However, for the
users in the LAN network, their WAN DNS server will assign them a public IP address for the mail server. So
for the LAN network to access the mail server (mail.planet.com.tw), they would have to go out to the Internet,
then to come back through the Multi-Homing Security Gateway to access the mail server. Essentially, the LAN
network is accessing the mail server by a real public IP address, while the mail server serves their request by
a NAT address and not a real one.
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