Vigor2950 Series User’s Guide
39
Add
It allows you to add the one you choose from the ARP table or
the IP/MAC address typed in
Add and Edit
to the table of
IP
Bind List
.
Edit
It allows you to edit and modify the selected IP address and MAC
address that you create before.
Delete
You can remove any item listed in
IP Bind List
. Simply click
and select the one, and click
Delete
. The selected item will be
removed from the
IP Bind List
.
Note:
Before you select
Strict Bind
, you have to bind one set of IP/MAC address for one
PC. If not, no one of the PCs can access into Internet. And the web configurator of the router
might not be accessed.
3
3
.
.
3
3
N
N
A
A
T
T
Usually, the router serves as an NAT (Network Address Translation) router. NAT is a
mechanism that one or more private IP addresses can be mapped into a single public one.
Public IP address is usually assigned by your ISP, for which you may get charged. Private IP
addresses are recognized only among internal hosts.
When the outgoing packets destined to some public server on the Internet reach the NAT
router, the router will change its source address into the public IP address of the router, select
the available public port, and then forward it. At the same time, the router shall list an entry
in a table to memorize this address/port-mapping relationship. When the public server
response, the incoming traffic, of course, is destined to the router’s public IP address and the
router will do the inversion based on its table. Therefore, the internal host can communicate
with external host smoothly.
The benefit of the NAT includes:
z
Save cost on applying public IP address and apply efficient usage of IP address.
NAT allows the internal IP addresses of local hosts to be translated into one public IP
address, thus you can have only one IP address on behalf of the entire internal hosts.
z
Enhance security of the internal network by obscuring the IP address.
There are
many attacks aiming victims based on the IP address. Since the attacker cannot be
aware of any private IP addresses, the NAT function can protect the internal network.
Note:
On NAT page, you will see the private IP address defined in RFC-1918. Usually we
use the 192.168.1.0/24 subnet for the router. As stated before, the NAT facility can map
one or more IP addresses and/or service ports into different specified services. In other
words, the NAT function can be achieved by using port mapping methods.
Below shows the menu items for NAT.
Summary of Contents for VIGOR2950
Page 7: ...Vigor2950 Series User s Guide vii 5 6 Contacting Your Dealer 209 ...
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Page 196: ...Vigor2950 Series User s Guide 188 14 Click Send 15 Now the firmware update is finished ...
Page 207: ...Vigor2950 Series User s Guide 199 3 Dialing from VPN Client site ...
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