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Page 51 / 161 Scroll up to view Page 46 - 50
51
Section 4
Configure
Step 9
Click on the
Pinholes
link in the Breadcrumb Trail to go to the Pinholes entry
page. Review your entries to be sure they are correct.
Step 10
Click the
Alert
button.
Step 11
Select the
Save and Restart
link to complete the entire Pinhole creation task
and ensure that the parameters are properly saved.
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.
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
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Page 52 / 161
52
Section 4
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
multiple static
WAN IP addresses to be
assigned to the Cayman 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 sepa-
rate 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.
Link
IPMaps
Comment
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 Cayman Gateway.
A single static or dynamic (DHCP) WAN IP address must be assigned to
support other devices on the LAN. These devices utilize Cayman’s default
NAT/PAT capabilities.
Response
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53
Section 4
Configure
What types of servers are supported by IPMaps?
IPMaps allows a Cayman Gateway to support servers behind the Gateway,
for example, web, mail, FTP, or DNS servers. 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 interface.
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
.
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54
Section 4
Configure
IPMaps Block Diagram
The following diagram shows the IPMaps principle in conjunction with
existing Cayman 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
...
...
Cayman 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 Cayman’s default NAT/PAT
Capabilities
IPMaps:
One-to-One
Multiple Address Mapping
LAN stations with WAN IP traffic
forwarded by Cayman’s IPMaps
LAN stations with WAN IP traffic
forwarded by Cayman’s NAT function.
WAN Interface
LAN Interface
192.168.1.1
192.168.1.2
192.168.1.3
192.168.1.n
.
.
.
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55
Section 4
Configure
Link
Protocol Lifetimes
Link
Default Server
Response
Description
Each NAT Protocol map entry will time-out if there is no traffic of that
protocol for the specified number of minutes. For example, UDP entries
time-out if there is no UDP traffic after 6 (default) minutes.
Response
Description
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 application 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.
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