Background Access to multiple PCs that are behind a firewall, NAT or router is fairly easy to configure if the user can forward or redirect TCP ports to the target PC's static LAN IP addresses. The examples illustrate access to four (4) XP Pro PCs behind a Linksys BEFSR41 (V1) Etherfast Cable/DSL Router.
Port Redirection Method (Option 1) - Preferred
Port Redirection Configuration
In the following example the four (4) PCs have been configured to listen on the default listening port detailed as follows.
PCName
IPAddress
RedirectedPort
ListeningPort
PC1
192.168.0.11
TCP 3389 (default)
TCP 3389 (default)
PC2
192.168.0.12
TCP 3390
TCP 3389
PC3
192.168.0.13
TCP 3391
TCP 3389
PC4
192.168.0.14
TCP 3392
TCP 3389
The Linksys router can be configured to pass Remote Desktop Client call requests to multiple PCs on the private LAN. This method illustrates a port forwarding/redirection scheme to multiple PCs that are each listening on the default port. Note that the Linksys Router must have UPnP enabled. Select UPnP Forwarding while on the Forwarding page.
UPnP Port Forwarding for Remote Desktop access to multiple PCs
Registry Change Method (Option 2)
IMPORTANT: This procedure contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article numbers to view the Microsoft Knowledge Base articles:
256986 - Description of the Microsoft Windows Registry
322756 - HOW TO: Back Up, Edit, and Restore the Registry in Windows XP.
To change the Remote Desktop Listening Port reference the Microsoft Knowledge Base Article Q306759 . Note the host XP Pro machine that the listening port was changed on MUST BE REBOOTED in order for the registry change to take effect. Read Microsoft Knowledge Base Article Q304304 for instructions on how to configure the Remote Desktop Client to call using an alternate port.
Port Forwarding Configuration
In the following example the four (4) PCs have been configured to listen on different ports detailed as follows.
PCName
IPAddress
ListeningPort
PC1
192.168.0.11
TCP 3389 (default)
PC2
192.168.0.12
TCP 3390
PC3
192.168.0.13
TCP 3391
PC4
192.168.0.14
TCP 3392
The Linksys router can be configured to pass Remote Desktop Client call requests to multiple PCs on the private LAN. This method illustrates a port forwarding scheme to multiple PCs that are each listening on a different port.
Port Forwarding for Remote Desktop access to multiple PCs
Call Scheme (Options 1 and 2)
Calling for Remote Desktop access to multiple PCs is accomplished by appending the Listening Port Number to the public IP address or alias of the router. If the firewall/router is configured correctly, the call will be successfully passed to the appropriate PC. Examples using DNS2Go are:
Call PC1 using the IP method:
12.34.56.78 or 12.34.56.78:3389
Call PC2 using the IP method:
12.34.56.67:3390
Call PC3 using the alias method:
YourAlias.dns2go.com:3391
Dynamic DNS Services (Some free, some not)
Dynamic DNS Network Services
No-IP.com
DNS2Go - Dynamic DNS Solution $$$$$
TZO.com $$$$$
Notes
Linksys router configuration pages illustrated are current as of the Linksys v1.42.7 firmware release for a BEFSR41 (V1) router.
The Linksys router must be configured so SPI is disabled on the Filters configuration page.
In the preceding examples, the specific ISP assigned public IP address should be substituted in place of the example IP. Similarly, the assigned alias should be substituted for the example alias.
Remote Desktop must be enabled on each PC.
Static IP addresses assigned to networked XP Pro PCs.
Windows XP UPnP functionality is installed.
Windows XP Remote Desktop Resources
The Remote Desktop How-To
Jeffrey Randow's Windows XP Remote Networking page.
posted by 貓貓。周 @ 7:37 PM
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