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eircom F1000 Modem User’s Guide
171
C
HAPTER
10
Dynamic DNS Setup
10.1
Overview
DNS
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and
vice versa. The DNS server is extremely important because without it, you must know the IP
address of a machine before you can access it.
In addition to the system DNS server(s), each WAN interface (service) is set to have its own static
or dynamic DNS server list. You can configure a DNS static route to forward DNS queries for certain
domain names through a specific WAN interface to its DNS server(s). The Device uses a system
DNS server (in the order you specify in the
Broadband
screen) to resolve domain names that do
not match any DNS routing entry. After the Device receives a DNS reply from a DNS server, it
creates a new entry for the resolved IP address in the routing table.
Dynamic DNS
Dynamic DNS allows you to update your current dynamic IP address with one or many dynamic
DNS services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You can also access
your FTP server or Web site on your own computer using a domain name (for instance
myhost.dhs.org, where myhost is a name of your choice) that will never change instead of using an
IP address that changes each time you reconnect. Your friends or relatives will always be able to
call you even if they don't know your IP address.
First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is for
people with a dynamic IP from their ISP or DHCP server that would still like to have a domain name.
The Dynamic DNS service provider will give you a password or key.
10.1.1
What You Can Do in this Chapter
•
Use the
DNS Entry
screen to view, configure, or remove DNS routes (
Section 10.2 on page
172
).
•
Use the
Dynamic DNS
screen to enable DDNS and configure the DDNS settings on the Device
(
Section 10.3 on page 173
).
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Chapter 10 Dynamic DNS Setup
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10.1.2
What You Need To Know
DYNDNS Wildcard
Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the same
IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use, for example,
www.yourhost.dyndns.org and still reach your hostname.
If you have a private WAN IP address, then you cannot use Dynamic DNS.
10.2
The DNS Entry Screen
Use this screen to view and configure DNS routes on the Device. Click
Network Setting > DNS
to
open the
DNS Entry
screen.
Figure 97
Network Setting > DNS > DNS Entry
The following table describes the fields in this screen.
Table 67
Network Setting > DNS > DNS Entry
LABEL
DESCRIPTION
Add new DNS
entry
Click this to create a new DNS entry.
#
This is the index number of the entry.
Hostname
This indicates the host name or domain name.
IP Address
This indicates the IP address assigned to this computer.
Modify
Click the
Edit
icon to edit the rule.
Click the
Delete
icon to delete an existing rule.
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10.2.1
Add/Edit DNS Entry
You can manually add or edit the Device’s DNS name and IP address entry. Click
Add new DNS
entry
in the
DNS Entry
screen or the
Edit
icon next to the entry you want to edit. The screen
shown next appears.
Figure 98
DNS Entry: Add/Edit
The following table describes the labels in this screen.
10.3
The Dynamic DNS Screen
Use this screen to change your Device’s DDNS. Click
Network Setting > DNS > Dynamic DNS
.
The screen appears as shown.
Figure 99
Network Setting > DNS > Dynamic DNS
Table 68
DNS Entry: Add/Edit
LABEL
DESCRIPTION
Host Name
Enter the host name of the DNS entry.
IPv4 Address
Enter the IPv4 IP address of the DNS entry.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
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The following table describes the fields in this screen.
Table 69
Network Setting > DNS > > Dynamic DNS
LABEL
DESCRIPTION
Dynamic DNS Setup
Dynamic DNS
Select
Enable
to use dynamic DNS.
Service
Provider
Select your Dynamic DNS service provider from the drop-down list box.
Hostname
Type the domain name assigned to your Device by your Dynamic DNS provider.
You can specify up to two host names in the field separated by a comma (",").
Username
Type your user name.
Password
Type the password assigned to you.
Dynamic DNS Status
User
Authentication
Result
This field shows whether or not the DDNS server has accepted the account information you
provided to use your DDNS service.
Last updated
Time
This field shows the most recent date and time the dynamic DNS information was updated.
Current
Dynamic IP
This field shows the WAN IP address the Device is currently using.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Page 175 / 359
eircom F1000 Modem User’s Guide
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C
HAPTER
11
Interface Group
11.1
Overview
By default, all LAN and WAN interfaces on the Device are in the same group and can communicate
with each other. Create interface groups to have the Device assign the IP addresses in different
domains to different groups. Each group acts as an independent network on the Device. This lets
devices connected to an interface group’s LAN interfaces communicate through the interface
group’s WAN or LAN interfaces but not other WAN or LAN interfaces.
11.1.1
What You Can Do in this Chapter
The
Interface Group
screens let you create multiple networks on the Device (
Section 11.2 on
page 175
).
11.2
The Interface Group Screen
You can manually add a LAN interface to a new group. Alternatively, you can have the Device
automatically add the incoming traffic and the LAN interface on which traffic is received to an
interface group when its DHCP Vendor ID option information matches one listed for the interface
group.
Use the
LAN
screen to configure the private IP addresses the DHCP server on the Device assigns to
the clients in the default and/or user-defined groups. If you set the Device to assign IP addresses
based on the client’s DHCP Vendor ID option information, you must enable DHCP server and
configure LAN TCP/IP settings for both the default and user-defined groups. See
Chapter 6 on page
103
for more information.

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