L2TP
L2TP (L2TPv2/PPPoX) is configured on the Access Groups tab for PPPoE scenarios. Peresvet ST emulates an LNS and the related tunnel parameters when testing a BRAS/LNS and PPP tunneling.
Typical sequence: create an access group of type PPPoE, add the PPP/authentication parameters, and then define an L2TP/LNS instance. Access sessions are established before Data Plane user traffic starts.
Table — L2TP/LNS Parameters
| Name | Description | Value |
|---|---|---|
| Instance name | LNS name in the task | A unique, descriptive name |
| IPv4 address | LNS address | Address on the Peresvet ST side |
| Secret | Tunnel shared secret | Must match the DUT/BRAS |
| Congestion mode | Congestion-control mode | As required by the testbed |
| Receive window | Receive-window size | Number of segments |
| Max retry | Number of control-message retries | |
| Hello interval | Keepalive interval | Seconds |
| ToS control / data | DSCP/ToS for control and data | Set separately when required |
| Data length / offset | Advanced: data length and offset | Compatibility flags |
| LCP padding | Advanced: LCP padding | Enable/disable |
| Client Auth ID | Advanced: client authentication identifier | According to the scenario |
Related sections: PPPoE and PPP and the general Access Groups tables under Access Plane. After starting, check tunnel/session establishment, secret/window errors, and access-group logs.