Host Table - Planet MH-4000 User 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.

4.1.10 Host Table

The Multi-Homing Security Gateway's Administrator may use the Host Table function to make the MH-2K/4K
act as a DNS Server for the LAN and DMZ network. All DNS requests to a specific Domain Name will be
routed to MH-2K/4K'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 come back through MH-2K/4K 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.
This odd situation occurs when there are servers in the DMZ network and they are bound to real IP addresses.
To avoid this, set up Host Table so all the LAN network computers will use MH-2K/4K as a DNS server, which
acts as the DNS Proxy.
Multi-Homing Security Gateway User's Manual
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