Does an AR enabled with L2TP support RADIUS authentication

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The L2TP Access Concentrator (LAC) and L2TP Network Server (LNS) support the RADIUS authentication (remote authentication) function to authenticate remote users.
PPP sessions are initiated by user devices and received by the LNS. After being authenticated by the LNS, remote users successfully set up PPP sessions with the LNS and can access resources in the enterprise headquarters. As the other endpoint of an L2TP tunnel, the LNS is a peer device of the LAC, and sets up an L2TP tunnel with the LAC. Additionally, the LNS is the logical termination point of a PPP session; therefore, the PPP client (user device) and the LNS establish a virtual point-to-point link.
An LAC provides PPP and L2TP processing capabilities on the packet switched network. The LAC establishes an L2TP connection with the LNS based on the user name or domain name in PPP packets so that PPP frames can be transmitted to the LNS.

Other related questions:
Does the AR enabled with L2TP support RADIUS authentication
The LAC and LNS support RADIUS authentication (remote authentication) to authenticate remote users. The LNS terminates PPP sessions. After being authenticated by the LNS, remote users successfully set up PPP sessions with the LNS and can access resources in the enterprise headquarters. For L2TP negotiation, the LNS is the peer device of the LAC, and set up an L2TP tunnel with the LAC. Additionally, the LNS is the logical termination point of a PPP session; therefore, the PPP client (user device) and the LNS establish a virtual point-to-point link. An L2TP Access Concentrator (LAC) provides PPP and L2TP processing capabilities on the packet switched network. The LAC establishes an L2TP connection with the L2TP network server (LNS) based on the user name or domain name in PPP packets so that PPP frames can be transmitted to the LNS.

Does the AR used as the LNS support RADIUS authentication
The AR that functions as the L2TP network server (LNS) supports RADIUS authentication.

Does the AR enabled with L2TP support NAT traversal
L2TP supports NAT traversal. Because L2TP uses UDP port 1701, the destination port number must be 1701 during translation.

Does the AR support L2TP
The AR supports L2TPv2 from V200R002C00.

Does the AR support RADIUS accounting
The support for RADIUS accounting is as follows: - AR routers of all versions support RADIUS authentication for NAC users. - AR routers of V200R002C00 and later versions support RADIUS authentication for administrators. - AR routers of V200R005C10 and later versions support RADIUS authentication for PPPoE users. - AR routers do not support RADIUS authentication for LAC and LNS users.

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