81

Configure

7.

Click on the

link. Click the

button. Add the

next Pinhole. Type the specific data for the third Pinhole.

☛

NOTE:

Note the following parameters for the “my-games” Pinhole:

1. The Protocol ID is UDP.

2. The external port is specified as a range.

3. The Internal port is specified as the lower range entry.

8.

Click on the

link. Review your entries to be

sure they are correct.

9.

Click the

button.

82

10.

Select the

link to complete the entire Pinhole creation

task and ensure that the parameters are properly saved.

☛

NOTE:

REMEMBER: When you have re-assigned the port address for the embedded

Web server, you can still access this facility.

Use the Gateway’s WAN address plus the new port number.

In this example it would be

<WAN Gateway address>:<new port number> or, in this case,

210.219.41.20:8100

You can also use the LAN-side address of the Gateway, 192.168.1.x:8100 to

access the web and 192.168.1.x:23 to access the telnet server.

IPMaps supports one-to-one Network Address Translation (NAT) for IP addresses assigned

to servers, hosts, or specific computers on the LAN side of the Netopia Gateway.

A single static or dynamic (DHCP) WAN IP address must be assigned to support other

devices on the LAN. These devices utilize Netopia’s default NAT/PAT capabilities.

83

Configure

Configure the IPMaps Feature

FAQs for the IPMaps Feature

Before configuring an example of an IPMaps-enabled network, review these frequently

asked questions.

What are IPMaps and how are they used?

The IPMaps feature allows

multi-

ple static

WAN IP addresses to be assigned to the Netopia Gateway.

Static WAN IP addresses are used to support specific services, like a web server, mail

server, or DNS server. This is accomplished by mapping a separate static WAN IP address

to a specific internal LAN IP address. All traffic arriving at the Gateway intended for the

static IP address is transferred to the internal device. All outbound traffic from the internal

device appears to originate from the static IP address.

Locally hosted servers are supported by a public IP address while LAN users behind the

NAT-enabled IP address are protected.

IPMaps is compatible with the use of NAT, with either a statically assigned IP address or

DHCP/PPP served IP address for the NAT table.

What types of servers are supported by IPMaps?

IPMaps allows a Netopia

Gateway to support servers behind the Gateway, for example, web, mail, FTP, or DNS serv-

ers. VPN servers are not supported at this time.

Can I use IPMaps with my PPPoE or PPPoA connection?

Yes. IPMaps

can be assigned to the WAN interface

provided they are on the same subnet

. Service

providers will need to ensure proper routing to all IP addresses assigned to your WAN inter-

face.

Will IPMaps allow IP addresses from different subnets to be assigned

to my Gateway?

IPMap will support statically assigned WAN IP addresses from the

same

subnet.

WAN IP addresses from different subnets are

not supported

.

84

IPMaps Block Diagram

The following diagram shows the IPMaps principle in conjunction with existing Netopia NAT

operations:

NAT/PAT Table

143.137.50.37

143.137.50.36

143.137.50.35

192.168.1.1

192.168.1.n

192.168.1.3

192.168.1.2

Netopia Gateway

Static IP Addresses

for IPMaps Applications

143.137.50.37

143.137.50.36

143.137.50.35

Static IP Addresses

or

DHCP/PPP Served IP Address

for Netopia’s default NAT/PAT

Capabilities

IPMaps:

One-to-One

Multiple Address Mapping

LAN stations with WAN IP traffic

forwarded by Netopia’s IPMaps

LAN stations with WAN IP traffic

forwarded by Netopia’s NAT function.

WAN Interface

LAN Interface

192.168.1.1

192.168.1.2

192.168.1.3

192.168.1.n

.

.

.

85

Configure

This feature allows you to:

•

Direct your Gateway to forward all externally initiated IP traffic (TCP and UDP protocols

only) to a default host on the LAN.

•

Enable it for certain situations:

– Where you cannot anticipate what port number or packet protocol an in-bound appli-

cation might use. For example, some network games select arbitrary port numbers

when a connection is opened.

– When you want all unsolicited traffic to go to a specific LAN host.

•

Configure for IP Passthrough.

Configure a Default Server.

This feature allows you to direct unsolicited or non-

specific traffic to a designated LAN station. With NAT “On” in the Gateway, these packets

normally would be discarded.

For instance, this could be application traffic where you don’t know (in advance) the port or

protocol that will be used. Some game applications fit this profile.

Use the following steps to setup a NAT default server to receive this information:

1.

Select the

toolbar button, then

, then the

link.

2.

From the pull-down menu, select

. The NAT Server IP

Address field appears.

3.

Determine the IP address of the LAN computer you have chosen to

receive the unexpected or unknown traffic.

Enter this address in the NAT Server IP Address field.

4.

Click the

button.

5.

Click the

button.

6.

Click the

link to confirm.