Caimore CM520-61F, User Manual, Page: 35 / 45

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4.3.3 OpenVPN
OpenVPN is an application layer VPN implementation based on OpenSSL library.
Compared to traditional VPN, its advantage is easier to configure.

Server IP
: IP address of server.

Protocol : TCP or UDP.

Device : Tap or tun.
Notice : Protocol and device should be set as same with server’s.
Configuration in client :
Package the files(ca.crt, client.crt, client.key) generated by the server and send them to
client. Then upload these files on router to corresponding place.
4.3.4 N2N
N2N is a two-tier VPN, it allows users to develop typical features of P2P application at
Network-layer, but not Application-layer. That means users can get the same visibility as the
local IP (for example, two PC in a N2N-network can ping each other successfully), and also
can visit each other by the IP address of N2N virtual network without caring about the
physical network address that PC currently belongs to. We can say that OpenVPN implements
the SSL by moving it from Application-layer to Network-layer, while N2N implementing P2P
by moving it from Application-layer to Network-layer.