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Page 46 / 161 Scroll up to view Page 41 - 45
46
Section 4
Configure
Link
IP Static ARP
Link
Pinholes
Response
Description
Your Gateway maintains a dynamic Address Resolution Protocol (ARP)
table to map IP addresses to Ethernet (MAC) addresses. It populates this
ARP table dynamically, by retrieving IP address/MAC address pairs only
when it needs them. Optionally, you can define static ARP entries to
map IP addresses to their corresponding Ethernet MAC addresses.
Unlike dynamic ARP table entries, static ARP table entries do not time
out. The IP address cannot be 0.0.0.0. The Ethernet MAC address entry
is in nn-nn-nn-nn-nn-nn (hexadecimal) format.
Response
Description
Pinholes allow you to transparently route selected types of network traf-
fic, such as FTP requests or HTTP (Web) connections, to a specific host
behind the Gateway. Creating a pinhole allows access traffic originating
from a remote connection (WAN) to be sent to the internal computer
(LAN) that is specified in the Pinhole page.
Contact your Network Administrator for LAN security questions.
Pinholes are common for applications like multiplayer online games.
Refer to software manufacturer application documentation for specific
traffic types and port numbers.
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Page 47 / 161
47
Section 4
Configure
Configure Specific Pinholes
Planning for Your Pinholes
Determine if any of the service applications that you want to provide on
your LAN stations utilize TCP or UDP protocols. If an application does,
then you must configure an Internal Server to implement port forwarding.
This is accessed from the
Advanced -> Internal Servers
page.
Example: A LAN Requiring Three Pinholes
The procedure on the following pages describes how you set up your NAT-
enabled Cayman Gateway to support three separate applications. This
requires passing three kinds of specific IP traffic through to your LAN.
Application 1
:
You have a Web server located on your LAN behind your
Cayman Gateway and would like users on the Internet to have access to it.
With NAT “On”, the only externally visible IP address on your network is
the Gateway’s WAN IP (supplied by your Service Provider). All traffic
intended for that LAN Web server must be directed to that IP address.
Application 2
: You want one of your LAN stations to act as the “central
repository” for all email for all of the LAN users.
Application 3
: One of your LAN stations is specially configured for game
applications. Again, you want this specific LAN station to be dedicated to
games.
A sample table to plan the desired pinholes is:
For this example, Internet protocols TCP and UDP must be passed through
the NAT security feature and the Gateway’s embedded Web (HTTP) port
must be re-assigned by configuring new settings on the Internal Servers
page.
WAN Traffic Type
Protocol
Pinhole Name
LAN Internal IP Address
Web
TCP
my-webserver
192.168.1.1
Email
TCP
my-mailserver
192.168.1.2
Games
UDP
my-games
192.168.1.3
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Page 48 / 161
48
Section 4
Configure
A diagram of this LAN example is:
TIPS
for making Pinhole Entries
1. If the port forwarding feature is required for Web services, ensure that the
embedded Web server’s port number is re-assigned
PRIOR
to any Pin-
hole data entry.
2. Enter data for one Pinhole at a time.
3. Use a unique name for each Pinhole.
If you choose a duplicate name, it will overwrite the previous informa-
tion without warning.
WAN
LAN
Ethernet
Interface
192.168.1.1
192.168.1.2
192.168.1.3
my-webserver
my-mailserver
my-games
Gateway
NAT
NAT Pinholes
Embedded
Web Server
210.219.41.20
210.219.41.20:8100
Ethernet
Interface
Internet
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Page 49 / 161
49
Section 4
Configure
Pinhole Configuration Procedure
Use the following steps:
Step 1
From the
Configure
toolbar button ->
Advanced
link, select the
Internal
Servers
link.
Since Port Forwarding is required for this example, the Cayman embedded Web
server is configured first.
To pass Web traffic through to your LAN station(s), select a Web (HTTP)
Port number that is greater than 1024. In this example, you choose 8100.
Step 2
Type
8100
in the Web (HTTP) Server Port text box.
Step 3
Step 4
Click the
Submit
button.
Step 5
Click
Advanced
. Select the
Pinholes
link to go to the Pinhole page.
The two text boxes,
Web (HTTP) Server Port
and
Telnet Sever Port
, on this
page refer to the port numbers of the Cayman Gateway’s
embedded admin-
istration ports
.
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Page 50 / 161
50
Section 4
Configure
Step 6
Click
Add
. Type your specific data into the Pinhole Entries table of this page.
Click
Submit
.
Step 7
Click on the
Pinholes
link in the Breadcrumb Trail to go to the Pinholes entry
page. Click
Add
. Add the next Pinhole. Type the specific data for the second
Pinhole.
Step 8
Click on the
Pinholes
link in the Breadcrumb Trail to go to the Pinholes entry
page. Click the
Add
. Add the next Pinhole. Type the specific data for the
third Pinhole.
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