Overview Installation Troubleshooting Contact | FAQ Specifications | Glossary | License |
Configuration: Basic Gateway TCP/IP | Wireless Print Server | USB | |
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L2F | Layer 2 Forwarding is an OSI layer 2 protocol that establishes a secure tunnel across the Internet to |
| create a virtual PPP connection between the user and the enterprise network. L2F is the most |
| established and stable layer 2 tunneling protocol. |
L2TP | Layer 2 Tunnel Protocol is a PPP extension that enables ISPs to operate VPNs. L2TP merges the |
| best features of the PPTP and L2F. L2TP is the emerging IETF standard. |
LAC | An L2TP access concentrator is a device to which the client directly connects through which PPP |
| frames are tunneled to the LNS. The LAC need only implement the media over which L2TP operates |
| to transmit traffic to one or more LNSs. The LAC may tunnel any protocol carried within PPP. The LAC |
| initiates incoming calls and receives outgoing calls. A LAC is analogous to an L2F NAS. |
LAN | A local area network provides a |
| building or campus. Ethernet is the most widely used LAN standard. |
layer | In networks, layers are software protocol levels. Each layer performs functions for the layers above it. |
| OSI is a reference model having seven functional layers. |
LCP | Link Control Protocol establishes, configures, and tests data link connections used by PPP. |
latency | The time required for a signal to pass through a device. It is often expressed in a quantity of symbols. |
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LNS | An L2TP network server is a termination point for L2TP tunnels where PPP frames are processed and |
| passed to higher layer protocols. An LNS can operate on any platform that terminates PPP. The LNS |
| handles the server side of the L2TP protocol. L2TP relies only on the single media over which L2TP |
| tunnels arrive. The LNS can have a single LAN or WAN interface but can terminate calls arriving at |
| any of the LACs full range of PPP interfaces (asynchronous, synchronous, ISDN, V.120, etc.). The |
| LNS initiates outgoing calls and receives incoming calls. An LNS is analogous to a home gateway in |
| L2F technology. |
loopback | A test that loops the transmit signal to the receive signal. Usually the loopback test is initiated on a |
| network device. The test is used to verify a path or to measure the quality of a signal on that path. |
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