qacafe - ip test solutions
Knowledge Base > ATM > Do I need a nas0 interface to run CDRouter with an ATM interface?

Do I need a nas0 interface to run CDRouter with an ATM interface?

CDRouter does not require a nas0 interface to use an ATM interface. The nas0 interface is created by the br2684ctl utility when Linux is configured to terminate an ATM PVC connection. When you create a nas0 interface, the Linux kernel maintains the ATM PVC and handles the desired ATM encapsulation.

CDRouter can open ATM PVCs directly from the ATM card without a nas0 interface. This is enabled in the CDRouter configuration file by configuring the following testvars: 

   testvar wanAtmInterface 0.0.35
   testvar wanAtmEncap 1483Bridged-LLC

When the testvar wanAtmInterface is configured, CDRouter ignores the setting of the testvar wanInterface. Please see the CDRouter User Guide for more details on the above testvars.

NOTE: You can still use a nas0 interface with CDRouter. CDRouter will treat the interface as an Ethernet interface and will not be able to access the ATM encapsulation layer.