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MTU:
The Maximum Transmission Unit (MTU) is a parameter that determines the largest
packet size (in bytes) that the router will send to the WAN. If LAN devices send larger
packets, the router will break them into smaller packets. Ideally, you should set this to
match the MTU of the connection to your ISP. Typical values are 1500 bytes for an
Ethernet connection and 1492 bytes for a PPPoE connection. If the router's MTU is set
too high, packets will be fragmented downstream. If the router's MTU is set too low, the
router will fragment packets unnecessarily and in extreme cases may be unable to
establish some connections. In either case, network performance can suffer.
MAC Address:
Each networking device has it's own unique MAC address defined by the
hardware manufacturer. Some ISP's may check your computer's MAC address. Some
ISP's record the MAC address of the network adapter in the computer or router used to
initially connect to their service. The ISP will then only grant Internet access to requests
from a computer or router with this particular MAC address. This router has a different
MAC address than the computer or router that initially connected to the ISP. If you need
to change the MAC address of the rounter's WAN-side Ethernet interface, either type in
an alternate MAC address (for example, the MAC address of the router initially connected
to the ISP) or copy the MAC address of a PC. To copy the MAC address of the computer
that initially connected to the ISP, connect to the router using that computer and click the
Clone Your PC's MAC Address
button. The WAN interface will then use the MAC
address of the network adapter in your computer.
NETWORK
Router Settings
These are the settings of the LAN (Local Area Network) interface for the router. The
router's local network (LAN) settings are configured based on the IP Address and Subnet
Mask assigned in this section. The IP address is also used to access this Web-based
management interface. It is recommended that you use the default settings if you do not
have an existing network.
IP Address
The IP address of your router on the local area network. Your local area network settings
are based on the address assigned here. For example, 192.168.0.1.
Subnet Mask
The subnet mask of your router on the local area network.
Local Domain Name
This entry is optional. Enter a domain name for the local network. LAN computers will
assume this domain name when they get an address from the router's built in DHCP
server. So, for example, if you enter
mynetwork.net
here, and you have a LAN side
laptop with a name of
chris
, that laptop will be known as
chris.mynetwork.net
. Note,
however, the entered domain name can be overridden by the one obtained from the
router's upstream DHCP server.
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DNS Relay
When DNS Relay is enabled, the router plays the role of a DNS server. DNS requests
sent to the router are forwarded to the ISP's DNS server. This provides a constant DNS
address that LAN computers can use, even when the router obtains a different DNS
server address from the ISP upon re-establishing the WAN connection. You should
disable DNS relay if you implement a LAN-side DNS server as a virtual server.
Primary DNS Server, Secondary DNS Server
Enter the IP addresses of the DNS Servers. Leave the field for the secondary server
empty if not used.
RIP (Routing Information Protocol)
Used to broadcast routing information among routers.
Enable RIP
Enable RIP if required by the ISP, if the LAN has multiple routers, or if the LAN has auto-
IP devices.
RIP Operating mode
This router supports both version 2 and version 1 of the RIP specification.
V1.
Use if none of the routers supports Version 2.
V2 Broadcast.
Use if some routers are capable of Version 2, but some are only capable
of Version 1.
V2 Multicast.
Use if this is the only router on the LAN or if all the routers support Version
2.
Router Metric
The additional cost of routing a packet through this router. The normal value for a simple
network is 1. This metric is added to routes learned from other routers; it is not added to
static or system routes.
Act as default router
Make this router the preferred destination for packets that are not otherwise destined.
Accept WAN updates
For security, disable this option unless required by the ISP.
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RIP Password
RIP Version 2 supports the use of a password to limit access to routers through the RIP
protocol. If the ISP or other LAN router requires a RIP password, enter the password
here.
DHCP
DHCP Server Settings
DHCP stands for Dynamic Host Configuration Protocol. The DHCP section is where you
configure the built-in DHCP Server to assign IP addresses to the computers and other
devices on your local area network (LAN).
Enable DHCP Server
Once your router is properly configured and this option is enabled, the DHCP Server will
manage the IP addresses and other network configuration information for computers and
other devices connected to your Local Area Network. There is no need for you to do this
yourself.
The computers (and other devices) connected to your LAN also need to have their
TCP/IP configuration set to "DHCP" or "Obtain an IP address automatically".
When you set
Enable DHCP Server
, the following options are displayed.
DHCP IP Address Range
These two IP values (
from
and
to
) define a range of IP addresses that the DHCP Server
uses when assigning addresses to computers and devices on your Local Area Network.
Any addresses that are outside of this range are not managed by the DHCP Server;
these could, therefore, be used for manually configured devices or devices that cannot
use DHCP to obtain network address details automatically.
It is possible for a computer or device that is manually configured to have an address that
does reside within this range. In this case the address should be reserved (see
DHCP
Reservation
below), so that the DHCP Server knows that this specific address can only
be used by a specific computer or device.
Your router, by default, has a static IP address of 192.168.0.1. This means that
addresses 192.168.0.2 to 192.168.0.254 can be made available for allocation by the
DHCP Server.
Example:
Your router uses 192.168.0.1 for the IP address. You've assigned a computer that you
want to designate as a Web server with a static IP address of 192.168.0.3. You've
assigned another computer that you want to designate as an FTP server with a static IP
address of 192.168.0.4. Therefore the starting IP address for your DHCP IP address
range needs to be 192.168.0.5 or greater.
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Example:
Suppose you configure the DHCP Server to manage addresses From 192.168.0.100 To
192.168.0.199. This means that 192.168.0.3 to 192.168.0.99 and 192.168.0.200 to
192.168.0.254 are NOT managed by the DHCP Server. Computers or devices that use
addresses from these ranges are to be manually configured. Suppose you have a web
server computer that has a manually configured address of 192.168.0.100. Because this
falls within the "managed range" be sure to create a reservation for this address and
match it to the relevant computer (see
Static DHCP Client
below).
DHCP Lease Time
The amount of time that a computer may have an IP address before it is required to
renew the lease. The lease functions just as a lease on an apartment would. The initial
lease designates the amount of time before the lease expires. If the tenant wishes to
retain the address when the lease is expired then a new lease is established. If the lease
expires and the address is no longer needed than another tenant may use the address.
Always Broadcast
If all the computers on the LAN successfully obtain their IP addresses from the router's
DHCP server as expected, this option can remain disabled. However, if one of the
computers on the LAN fails to obtain an IP address from the router's DHCP server, it may
have an old DHCP client that incorrectly turns off the broadcast flag of DHCP packets.
Enabling this option will cause the router to always broadcast its responses to all clients,
thereby working around the problem, at the cost of increased broadcast traffic on the
LAN.
NetBIOS Advertisement
Check this box to allow the DHCP Server to offer NetBIOS configuration settings to the
LAN hosts. NetBIOS allows LAN hosts to discover all other computers within the network,
e.g. within Network Neighbourhood.
Learn NetBIOS information from WAN
If NetBIOS advertisement is swicthed on, switching this setting on causes WINS
information to be learned from the WAN side, if available. Turn this setting off to configure
manually.
Primary WINS Server IP address
Configure the IP address of the preferred WINS server. WINS Servers store information
regarding network hosts, allowing hosts to 'register' themselves as well as discover other
available hosts, e.g. for use in Network Neighbourhood. This setting has no effect if the
'Learn NetBIOS information from WAN' is activated.
Secondary WINS Server IP address
Configure the IP address of the backup WINS server, if any. This setting has no effect if
the 'Learn NetBIOS information from WAN' is activated.
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NetBIOS Scope
This is an advanced setting and is normally left blank. This allows the configuration of a
NetBIOS 'domain' name under which network hosts operate. This setting has no effect if
the 'Learn NetBIOS information from WAN' is activated.
NetBIOS Registration mode
Indicates how network hosts are to perform NetBIOS name registration and discovery.
H-Node, this indicates a Hybrid-State of operation. First WINS servers are tried, if any,
followed by local network broadcast. This is generally the preferred mode if you have
configured WINS servers.
M-Node (default), this indicates a Mixed-Mode of operation. First Broadcast operation is
performed to register hosts and discover other hosts, if broadcast operation fails, WINS
servers are tried, if any. This mode favours broadcast operation which may be preferred if
WINS servers are reachable by a slow network link and the majority of network services
such as servers and printers are local to the LAN.
P-Node, this indicates to use WINS servers ONLY. This setting is useful to force all
NetBIOS operation to the configured WINS servers. You must have configured at least
the primary WINS server IP to point to a working WINS server.
B-Node, this indicates to use local network broadcast ONLY. This setting is useful where
there are no WINS servers available, however, it is preferred you try M-Node operation
first.
This setting has no effect if the 'Learn NetBIOS information from WAN' is activated.
Number of Dynamic DHCP Clients
In this section you can see what LAN devices are currently leasing IP addresses.
Revoke
The
Revoke
option is available for the situation in which the lease table becomes full or
nearly full, you need to recover space in the table for new entries, and you know that
some of the currently allocated leases are no longer needed. Clicking
Revoke
cancels
the lease for a specific LAN device and frees an entry in the lease table. Do this only if
the device no longer needs the leased IP address, because, for example, it has been
removed from the network.
Reserve
The
Reserve
option converts this dynamic IP allocation into a DHCP Reservation and
adds the corresponding entry to the DHCP Reservations List.

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