3Com 3C13636 Configuration Manual page 1256

3Com Router 3000 Ethernet Family
Configuration Guide
IV. DVPN client
A DVPN access device that operates as a client in a DVPN domain. A client must
successfully register with the DVPN server to access a DVPN domain. A DVPN client
does these things:
Initiate registration with the DVPN server to join a DVPN domain.
Establish sessions with the DVPN server for data transmission.
Establish sessions with other DVPN clients in the DVPN domain automatically.
Encrypt packets using IPSec.
V. DVPN ID
The unique identifier of a DVPN domain. A DVPN access device can belong to multiple
DVPN domains and therefore have multiple DVPN IDs.
VI. Map
A registration channel, called map, is established between a DVPN client and a DVPN
server when the DVPN client attempts to register with the DVPN server. After the client
gets registered, the map remains there until the DVPN client exits the DVPN domain or
the network. Both the client and the server keep information about the map, including
the ID of the DVPN domain, the private and public IP addresses of the peer, the UDP
port used, and the status, type, and control ID of the map.
VII. Session
DVPN tunnel for data transmission. In a DVPN domain, sessions are established
between pairs of DVPN access devices for connecting private networks. Similar to map
information, session information includes the ID of the DVPN domain, the private and
public IP addresses of the peer, the UDP port used, the status of the session, and the
type of the session.
VIII. Redirect
Packet redirect mechanism. For two clients with no session, communications between
them rely on the DVPN server. Before forwarding packets between two clients, the
DVPN server determines whether a separate session can be established between the
two clients. If possible, the DVPN server sends a redirect packet carrying information
about the destination client to the initiating client so that they may set up a session
directly.
IX. Active side and passive side
For the two ends of a session, one end must be the active side, and the other must be
the passive side. If a session is established between a client and a server, the client
acts as the active side and the server acts as the passive side. If a session is
established between two clients, the one that initiates the session is the active side and
the other is the passive side.
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Chapter 4 DVPN