Digi ConnectPort X4 User's Guide download pdf (Page 14)

Features

Point-to-Point Protocol (PPP)

The Point-to-Point Protocol (PPP) transports multi-protocol packets over point-to-point links. PPP

encapsulates the data packet, allows the server to inform the dial-up client of its IP address (or

client to request the IP address), authenticates the exchange, negotiates multiple protocols, and

reassembles the data packet for network communication. ConnectPort X Family devices support

PPP as the connection protocol from the Digi device to the cellular IP network with NAT (Network

Address Technology).

Network Address Translation (NAT)/Port Forwarding

Network Address Translation (NAT) reduces the need for a large amount of publicly known IP

addresses by creating a separation between publicly known and privately known IP addresses.

Advanced Digi Discovery Protocol (ADDP)

The Advanced Digi Discovery Protocol (ADDP) runs on any operating system capable of sending

multicast IP packets on a network. ADDP allows the system to identify all ADDP-enabled Digi

devices attached to a network by sending out a multicast packet. The Digi devices respond to the

multicast packet and identify themselves to the client sending the multicast.

ADDP communicates with the TCP/IP stack using UDP. The TCP/IP stack should be able to

receive multicast packets and transmit datagrams on a network.

Not all Digi devices support ADDP. Access to ADDP service can be enabled or disabled, but the

network port number for ADDP cannot be changed from its default.

Generic Routing Encapsulation (GRE) Passthrough

Encapsulating Security Payload (ESP)

ESP Passthrough

Generic Routing Encapsulation (GRE) and Encapsulating Security Payload (ESP) are routing

protocols that are used to route (tunnel) various types of information between networks.

GRE applies to the encapsulation of IP datagrams tunnelled through the internet. The encapsulation

includes security, typically in the form of IPSec (IP security), and is most commonly found in VPN

(Virtual Private Network) implementation. RFC (Request For Comment) 1701 and 1702 define

these standards.Similarly, ESP is used in conjunction with IPsec as a possible way of carrying IP

packets for a Virtual Private Network (VPN) setup. ESP is defined in RFC 2406.

In ESP Passthrough and GRE Passthrough, inbound IPsec ESP or GSP protocol traffic is

forwarded from to a VPN device connected to the Digi device’s Ethernet port.

Note: If an Auto-key Internet Key Exchange (IKE)-based VPN is used, UDP port 500 must also be

forwarded.

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Digi ConnectPort X4 User's Guide Page 14