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Page 86 / 122 Scroll up to view Page 81 - 85
MBR L13
–
User’s
Guide
86
To add a new entry to the list:
1
.
Click the
New DNS Entry
button. The
DNS Entry
screen will appear (see Figure 116).
2
.
Enter the computer's host name and IP address.
3
.
Click
OK
to save the settings.
Figure 116:
Add or Edit a DNS Entry
To edit the host name or IP address of an entry:
1
.
Click the
Edit
button that appears in the Action column. The
DNS Entry
screen appears.
If the host was manually added to the DNS Table, then you may modify its host name and/or IP address,
otherwise you may only modify its host name.
2
.
Click
OK
to save the settings.
To remove a host from the DNS table:
Click the
Delete
button that appears in the Action column. The entry is removed from the table.
3.7.6
DHCP Server
Your gateway's Dynamic Host Configuration Protocol (DHCP) server makes it possible to easily add computers that are
configured as DHCP clients to the local network. It provides a mechanism for allocating IP addresses and delivering
network configuration parameters to such hosts. L13 default DHCP server is the LAN bridge. A client (host) sends out a
broadcast message on the LAN requesting an IP address for itself. The DHCP server then checks its list of available
addresses and leases a local IP address to the host for a specific period of time while simultaneously designating this IP
address as `taken'. At this point the host is configured with an IP address for the duration of the lease. The host can
choose to renew an expiring lease or let it expire. If it chooses to renew a lease, then it will also receive current
information about network services, as it did with the original lease, allowing it to update its network configurations
to reflect any changes that may have occurred since it first connected to the network. If the host wishes to terminate
a lease before its expiration, it can send a release message to the DHCP server, which will then make the IP address
available for use by others.
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User’s
Guide
87
Figure 117:
DHCP Server
Your gateway's DHCP server:
Defines the range of IP addresses that can be allocated in the LAN.
Defines the length of time for which dynamic IP addresses are allocated.
Provides the above configurations for each LAN device and can be configured and enabled/disabled
separately for each LAN device.
Can assign a static lease to a LAN PC so that it receives the same IP address each time it connects to the
network, even if this IP address is within the range of addresses that the DHCP server may assign to other
computers.
Provides the DNS server with the host name and IP address of each PC that is connected to the LAN.
Additionally, L13 can act as a DHCP relay, escalating DHCP responsibilities to a WAN DHCP server. In this case, the L13
will act merely as a router, while its LAN hosts will receive their IP addresses from a DHCP server on the WAN.
3.7.6.1
IP Address distribution / DHCP Server Settings
Figure 118: IP Address Distribution
Note:
If a device is listed as
Disabled
in the
Service
column, then DHCP services are not being provided to hosts
connected to the network through that device. This means that the gateway will not assign IP addresses to these
computers, which is useful if you wish to work with static IP addresses only.
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MBR L13
–
User’s
Guide
88
To edit the DHCP server settings for a device:
1.
In the Service section, in the
IP Address Distribution
combo-box, select the
DHCP service:
Disabled
Disable the DHCP server for this device.
DHCP Server
Enable the DHCP server for this device.
DHCP Relay
Set this device to act as a DHCP relay (refer to section 3.7.6.2).
2.
Assuming you have chosen DHCP Server, complete the following fields:
Start IP Address
The first IP address that may be assigned to a LAN host. Since the gateway's
default IP address is 192.168.1.1, this address must be 192.168.1.2 or greater.
End IP Address
The last IP address in the range that can be used to automatically assign IP
addresses to LAN hosts.
Subnet Mask
A mask used to determine what subnet an IP address belongs to. An example of a
subnet mask value is 255.255.0.0.
WINS Server
OpenRG can operate as a Windows Internet Naming Service (WINS) server,
handling name registration requests from WINS clients and registering their names and IP
addresses. WINS is a name resolution software from Microsoft that converts NetBIOS names to
IP addresses. Windows machines that are named as PCs in a workgroup rather than in a domain,
use NetBIOS names which must be converted to IP addresses if the underlying transport
protocol is TCP/IP.
Lease Time In Minutes
Each device will be assigned an IP address by the DHCP server for this
amount of time when it connects to the network. When the lease expires, the server will
determine if the computer has disconnected from the network. If it has, the server may reassign
this IP address to a newly-connected computer. This feature ensures that IP addresses that are
not in use will become available for other computers on the network.
Provide Host Name If Not Specified by Client
If the DHCP client does not have a host name, the
gateway will automatically assign one for him.
1.
Click
OK
to save the settings.
3.7.6.2
IP Address distribution / DHCP Relay Settings
To configure a device as a DHCP relay:
1.
In the Local IP Settings combo-box, select
Obtain an IP Address Automatically
.
2.
In the
IP Address Distribution
combo-box, select the
DHCP Relay
option (see Figure 119:
Settings for DHCP
relay).
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MBR L13
–
User’s
Guide
89
Figure 119:
Settings for DHCP relay
3.
Click the
New IP Address
link. The
DHCP Relay Server Address
screen appears:
Figure 120: DHCP Relay Server Address
4.
Specify the IP address of the DHCP server.
5.
Click
OK
to save the settings.
6.
Click
OK
once more in the
DHCP Settings
screen.
3.7.6.3
DHCP Connections
To view a list of computers currently recognized by the DHCP server:
Click the
Connection List
button that appears at the bottom of the
DHCP Server screen (see Figure 118). The
DHCP Connections screen appears:
Page 90 / 122
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–
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Guide
90
Figure 121: DHCP Connections
To define a new connection with a fixed IP address:
1.
Click the
New Static Connection
link. The DHCP Connection Settings
screen appears:
Figure 122: DHCP Connection Settings
2.
Enter a host name for this connection.
3.
Enter the fixed IP address that you would like to have assigned to the computer.
4.
Enter the MAC address of the computer's network card.
Note
:
A device's fixed IP address is actually assigned to the specific MAC address installed on the LAN
computer. If you replace this network card, then you must update the device's entry in the DHCP Connections
list with the new network card's MAC address.
5.
Click OK to save the settings.
The DHCP Connections screen will reappear (see Figure 123), displaying the defined static connection. This
connection can be edited or deleted using the standard action icons.

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