# Firewall (CXi II and MXe III)

## Description

NOTE: The Firewall feature is not applicable to MiVoice Business for Industry Standard Servers (ISS).

For security, the CXi II and MXe III can function as a firewall, dropping or rejecting unknown packets, allowing or disallowing IPSec
A standard security protocol that provides authentication and encryption over the Internet. IPSec is used predominantly in the construction of Virtual Private Networks. and PPTP
PPTP or Point to Point Tunneling Protocol encapsulates data sent over the Internet within a virtual private network (VPN). pass-through, and performing many-to-1 NAT
See "Network Address Translation" (IP masquerading).

By default, all inbound traffic is blocked by the firewall with the exception of packets for establishing PPTP VPN
See Virtual Private Network. tunnels and ICMP
ICMP or Internet Control Message Protocol is a protocol that generates error messages, test packets, and informational messages related to IP. requests to the IP address of the WAN interface.

NOTE: The MXe III-L controller does not support WAN functionality.

## Conditions and Feature Interactions

- Firewall protection is provided on the WAN (Internet Gateway) port only.

## Programming

1. Complete the Firewall Control form.

2. (Optional) Program the Port Forward Table form ( ) to allow external traffic to reach resources on the internal network.

## Device Support

Not applicable

## Operation

None