3Com 3C888 User Guide - Page 88

Configuring the Local DNS Table, From the LAN Modem Main Configuration click

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88 CHAPTER 7: ADVANCED CONFIGURATION 4 Click Submit. Configuring the Local DNS Table The Dual 56K LAN Modem includes a local DNS Table for configuring up to ten static DNS entries. This allows the LAN Modem to resolve designated IP addresses locally. The Local DNS Table can be used to suppress spurious calls which can occur when an application on the LAN generates packets which in turn launch an unwanted call to your service provider. For example, to suppress spurious calls, do the following. If an application on the LAN is generating packets to a particular domain address, such as "company.com", you would enter that name ("company.com") in the Domain Name field, and then enter 192.168.1.29 in the IP address field. This is an IP address that resides on the LAN Modem's default subnet, but by default is not used by any attached workstations. Now, packets to "company.com" will be routed to this unused IP address, and will no longer launch automatic calls. Another potential application of the Local DNS Table is to assign a domain name to a frequently visited IP address. In this case, you would enter the IP address in the IP address field, and enter a domain name of your choice, such as "my_site.com" in the Domain Name field. This will resolve the name "my_site.com" to the associated IP address. s To access the DNS Configuration Table, follow these steps: 1 From the LAN Modem Main Configuration Page, click the Advanced button. 2 Click the Local DNS Table button. The Local DNS Table window opens, as shown in Figure 51.

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88
C
HAPTER
7: A
DVANCED
C
ONFIGURATION
4
Click
Submit
.
Con
fi
guring the Local
DNS Table
The Dual 56K LAN Modem includes a local DNS Table for configuring up to ten
static DNS entries. This allows the LAN Modem to resolve designated IP addresses
locally. The Local DNS Table can be used to suppress spurious calls which can occur
when an application on the LAN generates packets which in turn launch an
unwanted call to your service provider.
For example, to suppress spurious calls, do the following. If an application on the
LAN is generating packets to a particular domain address, such as
“company.com”, you would enter that name (“company.com”) in the Domain
Name field, and then enter
192.168.1.29
in the IP address field. This is an IP
address that resides on the LAN Modem’s default subnet, but by default is not
used by any attached workstations. Now, packets to “company.com” will be
routed to this unused IP address, and will no longer launch automatic calls.
Another potential application of the Local DNS Table is to assign a domain name
to a frequently visited IP address. In this case, you would enter the IP address in the
IP address field, and enter a domain name of your choice, such as “my_site.com”
in the Domain Name field. This will resolve the name “my_site.com” to the
associated IP address.
■
To access the DNS Configuration Table, follow these steps:
1
From the LAN Modem Main Configuration Page, click the
Advanced
button.
2
Click the
Local DNS Table
button.
The Local DNS Table window opens, as shown in Figure 51.