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Mppe-(40|128)
Mppe-StateFul
Add Default Route
: If it’s checked, then all the data passing through the router will be
sent to PPTP tunnel. Also means, all the devices connected to the router are only
allowed to access external network through PPTP tunnel.
NAT
: If it’s checked, the devices connected to the router can access PPTP server
through the tunnel. If not, then these devices only can access server via Internet.
Specify Local IP / Specify Peer IP
: If PPTP server allows it, router can specify a local
tunnel IP address.
Tunnel Check Interval / Tunnel Check Times
: After tunnel is built, in order to check
tunnel state, router will send LCP packet to server in every tunnel check interval. When
the number of tunnel-checking failures over the value of “Tunnel Check Times”, router
will initiate to terminate the connection and send a request to rebuild the tunnel.
Other Parameters
: It’s used in a situation where a special parameter is required to
negotiate when establishing a tunnel. In general, this parameter can be left in blank,
unless server is requiring a special negotiation parameter.
Format -- “novj;novjcomp”, between each parameter should be separated by “;”.
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.
Interface
: Device name.
Local IP
: Local tunnel IP address.
Subnet
: Edge node interface subnet mask.
Group
: Group name of the connection.
Password
: Group password of the connection.
