GRE is a transport layer protocol, designated as IP protocol number 47, is used by many routers, WAN switches and VPN concentrators, to effectively tunnel traffic over a WAN between routers. Generic Routing Encapsulation (GRE) forwarding
It should not be disabled unless there is a specific reason to do so. NAT is enabled by default on the Connect WAN. The Connect WAN need be provided only one IP address from the wireless carrier. IP Address Availability: IP addresses are in short supply and cost money. Security: NAT hides the Private IP addresses of the devices on the Connect WAN''''s Ethernet network.Ģ. HTTP or telnet connections for configuration or monitoring), or is forwarded to hosts via the Ethernet interface based either on GRE or TCP/UDP port forwarding which is covered below.ġ. Incoming (mobile terminated) traffic is either designated to the Connect WAN itself (i.e.
An internal table tracks which internal IP address made the outgoing request so that responses get sent to the proper requestor.įor example, a workstation at IP address 192.168.1.15 sends a request to The source IP address is changed by the Connect WAN address translation to the public Outgoing traffic (mobile initiated) from the private network to the public mobile network assumes the IP address of the public mobile interface. NAT allows the Digi Connect WAN to have a single public IP address on the mobile link, while allowing multiple private IP addressed devices connected to the Ethernet interface. This document describes each function, how they are used in conjunction with each other, how they are used, and what issues can occur with each if not used properly.
The Digi Connect WAN supports four features which provide security and IP traffic forwarding when using incoming or Mobile Terminated connections:Ģ.
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