When configured in Bridge Mode, the Cayman will act as a pass-through device and allow the workstations on your LAN to have public addresses directly on the internet. NOTE: In this mode the Cayman is providing NO firewall protection as is afforded by NAT. Also, only the workstations that have a public address can access the internet. This can be useful when you need to use all five of your static public IP's on the LAN.

PLEASE NOTE: If your internet account uses PPP over Ethernet, a device behind the router that will be obtaining the public IP address must be able to perform PPPoE Authentication in this configuration. In other words, the Cayman will no longer provide the ISP Username and ISP Password required to logon to the ISP server. To avoid an interruption of internet access, please confirm the correct settings with your ISP and the compatibility of the device being installed behind the router.

CAUTION: Placing the router into bridge mode should only be done if you are certain that all circumstances warrant this action. Please be sure to read and understand this document thoroughly before implementing this procedure. Please be advised that unless these instructions are followed precisely you risk losing your internet access and ethernet access into the router configuration screens. This circumstance, should it arise, may require the purchase of a serial cable to gain access back into the router via the console port. If you have any doubts about the ramifications of this procedure, we strongly suggest that you first contact Netopia Technical Support for further advice.

IMPORTANT----PLEASE NOTE: This configuration guide is applicable ONLY if you have a Bridged subnet on the WAN interface of your router. If you have a subnet routed to the ethernet interface of the router, this Quick Guide is not applicable to you.

Parameters:

Below is a list of hardware and firmware loads that this Technical Note is based upon:

Hardware	Firmware/Version	Interface
Cayman 3546	6.3.0 R7 and later	Netopia
Cayman 3341 / 3346	6.3.0 R7 and later	Netopia
Cayman 3220	5.6.2 R5 and later	Classic or Netopia

To update your router firmware, go to our Firmware Update Page.

Assumptions:

• This guide assumes that you are configuring a Cayman ADSL Router.
  NOTE: This Quick Guide is not applicable to the Model 2E Ethernet to Ethernet Router.
• This guide assumes that, where reference is made to private IP addressing, that you are using the default IP address of 192.168.1.254 as the Cayman's ethernet address. If this value has been changed during subsequent configuration, modify your settings accordingly.
• This guide assumes that your ISP has instructed you to configure the router in "bridge mode."

Before you start:

• Browse into the Cayman router's web interface at 192.168.1.254.
  PLEASE NOTE: For future access into the configuration screens of the Cayman router after you have completed this procedure you should make note of the current ethernet address of the router. After it is in bridge mode, future browsing into the router can be accomplished by placing the IP address of a local workstation on the same subnet as this private address. You will then be able to browse into the router.
  In COS version 5.6.2, refer to Step #4.
  In COS version 6.3.0, refer to Step #5.
• In these instructions, where reference is made to "Check" a selection, this indicates that the feature or option is to be enabled with a selectable checkmark.
  Where reference is made to "Uncheck" a selection, this indicates that the feature or option is to be disabled, resulting with a blank checkmark box.

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Configuring for Bridge Mode in COS 6.3.0 (and later):

1. Browse into the Cayman Router's web interface.
2. Click on the Configure link in the upper Menu bar.
3. Click on the LAN link.
4. In the box titled LAN IP Interface :
   
   
   1. "Check" the Enable Interface selection.
   
   *Use this address to access the router in the future.
   

   Caution! At this stage we strongly suggest that you assign the ethernet (LAN) IP address the default value of 192.168.1.254. This way, if you ever need to get back into the router for configuration changes or to add feature keys, you can just connect a workstation directly to the four-port ethernet switch. With the computer set at an address on the same subnet and a default gateway of 192.168.1.254, subnet mask 255.255.255.0, you'll be able to easily browse or telnet into the router.

   2. Click on Submit.
   

5. Click on DHCP Server in the box titled Other LAN Options:
   1. Server Mode must be set to Off.
   
   Caution! Leaving the DHCP mode enabled may cause unpredictable behavior with the ISP's server as it negotiates to assign the router's public IP address (es). Please verify that this has NOT been left in Server mode.
   2. Click on Submit.

6. Click on the Configure field in the file path bar directly above the selection box.
   
   
7. At the bottom of the "Configuration Options" click on the Advanced link.
   

   

8. Under the heading of Services, click on the Ethernet Bridge link.

   Under the heading Ethernet Bridge: "Check" the Enable Bridging Function selection. "Uncheck" the Enable WAN-to-WAN Bridging selection. Under Ethernet 100BT (LAN) (10BT (LAN) on the 3220-H): "Check" Enable Bridging on Port. Under RFC-1483 Bridged Ethernet vcc1 (WAN), or under PPP over Ethernet vcc1 (WAN) [as per your configuration]: "Check" Enable Bridging on Port. "Uncheck" Filter PPPoE Only. Click on Submit.

   PLEASE NOTE: For Cayman 3341 & 3346 models: Enable Bridging Function is Always On by default. LAN Bridging on Port is Always On by default. "Check" Enable Bridging on Port for the WAN vcc1. These models are most typically PPP over Ethernet. Click on Submit.

   
   
   
   

9. Click on the Configure field in the file path bar directly above the selection box.
   
   

   

10. Click on the WAN link that takes you to
    WAN IP Interfaces box.
11. Click on RFC-1483 Bridged Ethernet vcc1,
    or on PPP over Ethernet vcc1
    [as per your configuration]:
    
    
    1. "Uncheck" the Enable Interface box.
    2. Click on Submit.

    

12. Click on the WAN field in the file path bar directly above the selection box.
    
    
13. In the box labeled IP Gateway:
    1. "Uncheck" the Enable Gateway Option selection.
    2. Click on Submit.

14. Click on Configure in the upper menu bar.
15. Once you have input all appropriate information, click on the symbol in your upper right hand corner to validate the changes.
16. Click on Save and Restart.
17. At this point the router will reboot and when it comes back up it will be ready to connect.



The Validation passed! and Ready to "Save and Restart"

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Configuring for Bridge Mode in COS 5.6.2 R5:

1. Browse into the Cayman Router's web interface.



2. Click on the Expert Mode link in the bottom right corner.








3. Click on the Ethernet A (LAN) link on the left side of the page.



4. Under DHCP Settings Mode, click the On radio button to enable DHCP.
5. Confirm that the DHCP Range conforms to the LAN IP address.

QuickTip! If you ever need to get back into the router for configuration changes or to add feature keys in the future, just connect a workstation directly to the four-port ethernet switch. With the computer set to obtain an IP address automatically, the Cayman will assign the IP and you'll be able to easily browse or telnet into the router.


6. Click on Save. You will be sent back to the main menu screen.






7. Click on the Bridge link.



8. On the Bridge Configuration screen:


1. Select Bridge option On.



2. Under Interface, select Ethernet option On.



3. Under Interface, select DSL VCC(1) option On.



4. Under Bridging Policy, leave VC-to-VC Bridging selected Off.
9. Click on Save.












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10. Back at the main menu, click on the DSL Port(WAN) link.



11. On the ATM Configuration screen, click on the Config button. This opens the VCC 1 Configuration screen.



12. Under IP Settings:


1. Select IP Interface radio button Off.
2. Select NAT radio button Off.
3. Select IP Gateway radio button Off.




13. Click on Save.
    
    
14. Back on the ATM Configuration page, click on the Home link.



15. Click on Restart to save the changes to your configuration.

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You've now configured your Cayman Router for bridging, and it is going to bridge all traffic across the WAN. You will need to configure the computers on your LAN. These settings must be made in accordance with the IP addresses supplied by your ISP. If you ever need to get back into the Cayman again for management reasons, you can set your computer for DHCP. The Cayman will then assign an IP address automatically if you have left it set to serve DHCP. (*note: see step #4 above under COS  5.6.2 configuration, or the *note under step #5 for COS 6.3 configuration.)