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In order to distinguish WiFi users from each other, the ESR BRAS requires an identifier that uniquely identifies it. This identifier is the MAC address of the WiFi user's device from which it makes the connection. Therefore, it is necessary for the BRAS to receive traffic with the MAC headers of the user's device. For this purpose, it is necessary to provide an L2 network between the WiFi user and BRAS, or to route WiFi user traffic to BRAS within the VPN through the operator's L3 infrastructure. To organise such a VPN, an ESR-10/20/100/200 router is installed in the customer's network, which raises GRE tunnels to ESR-100/200/1000/1200/1500/1700 operating in Wireless-Controller mode (more details about this mode can be found in Configuring ESR by connecting AP via L3 access network (WiFi L3 diagram). Eltex access points can also build GRE-tunnels, which makes it possible to connect them to BRAS via L3-infrastructure of the operator without additional installation of ESR-10/20/100/200. Figure 1.1.1 below shows the circuit diagram:
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BRAS configuration is described in detail in the BRAS. L2 WiFi - setup and quick start guide, so below will be the configuration with necessary explanations for new settings.
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In the scheme with generic AP identification by vlan, this is the end of SoftWLC configuration for working with BRAS, then it is necessary to connect to the previously configured vlan and make sure that there is a redirect to the portal, the ability to pass the authorisation in demo mode and access the Internet after authorisation. Trableshooting when connecting BRAS clients is considered in the link: BRAS. Troubleshooting Guide
For correct operation of generic AP identification using option 82 it is necessary to initialise them. The necessary settings for this are described below.
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