# Configuring Remote Access

The E Series router supports the following remote access functionality:

- Broadband Remote Access Server (B-RAS)—This application runs on the router and is responsible for:
  - Aggregating the output from DSLAMs
  - Providing user PPP sessions and PPP session termination
  - Enforcing QoS policies
  - Routing traffic into an ISP’s backbone network

    See JunosE Broadband Access Configuration Guide.

- Layer 2 Tunneling Protocol (L2TP)—A method of encapsulating layer 2 packets, such as PPP, for transmission across a network. In an L2TP relationship, an L2TP access concentrator (LAC) forms a client-server relationship with a destination, known as an L2TP network server (LNS), on a remote network.

  You can configure the router to act as an LAC in PPP pass-through mode. The router creates tunnels dynamically by using AAA authentication parameters and transmits L2TP packets to the LNS through IP/UDP. See JunosE Broadband Access Configuration Guide.

- Non-PPP equal access—A method of allowing remote access in which the router provides IP addresses to subscribers’ computers through Dynamic Host Configuration Protocol (DHCP). This method is particularly convenient for broadband (cable and DSL) environments or environments that use bridged Ethernet over ATM, because network operators can support one central system rather than an individual PPPoE client on each subscriber’s computer. See JunosE Broadband Access Configuration Guide.