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Chapter 7 Network Setting
WiMAX Device Configuration User’s Guide
92
If the Primary and Secondary DNS Server fields are not specified, for instance, left as 0.0.0.0,
the WiMAX Device tells the DHCP clients that it itself is the DNS server. When a computer sends a
DNS query to the WiMAX Device, the WiMAX Device forwards the query to the real DNS server
learned through IPCP and relays the response back to the computer.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It does
not mean you can leave the DNS servers out of the DHCP setup under all circumstances. If your ISP
gives you explicit DNS servers, make sure that you enter their IP addresses. This way, the WiMAX
Device can pass the DNS servers to the computers and the computers can query the DNS server
directly without the WiMAX Device’s intervention.
RIP Setup
RIP (Routing Information Protocol) allows a router to exchange routing information with other
routers. The RIP Direction field controls the sending and receiving of RIP packets. When set to:
• RX/TX - the WiMAX Device will broadcast its routing table periodically and incorporate the RIP
information that it receives.
• RX Only - the WiMAX Device will not send any RIP packets but will accept all RIP packets
received.
• TX Only - the WiMAX Device will send out RIP packets but will not accept any RIP packets
received.
• None - the WiMAX Device will not send any RIP packets and will ignore any RIP packets received.
The Version field controls the format and the broadcasting method of the RIP packets that the
WiMAX Device sends (it recognizes both formats when receiving). RIP-1 is universally supported;
but RIP-2 carries more information. RIP-1 is probably adequate for most networks, unless you have
an unusual network topology.
Both RIP-2B and RIP-2M sends the routing data in RIP-2 format; the difference being that RIP-2B
uses subnet broadcasting while RIP-2M uses multicasting.
Port Forwarding
A NAT server set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP, that
you can make accessible to the outside world even though NAT makes your whole inside network
appear as a single machine to the outside world.
With port forwarding, you can forward incoming service requests to the server(s) on your local
network. You may enter a single port number or a range of port numbers to be forwarded, and the
local IP address of the desired server. The port number identifies a service; for example, web
service is on port 80 and FTP on port 21. In some cases, such as for unknown services or where one
server can support more than one service (for example both FTP and web service), it might be
better to specify a range of port numbers.
In addition to the servers for specified services, NAT supports a default server. A service request
that does not have a server explicitly designated for it is forwarded to the default server. If the
default is not defined, the service request is simply discarded.
For example, let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the
example), port 80 to another (B in the example) and assign a default server IP address of