User`s manual

UC-7408 User’s Manual Managing Communication

4-21

NOTE Click on the following links for more information about MIB II and RS-232 like group:

http://www.faqs.org/rfcs/rfc1213.h

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http://www.faqs.org/rfcs/rfc1317.h

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Æ UC-7408 does NOT support SNMP trap.

The following tables list the variables supported by UC-7408.

Open VPN

This function is only available for firmware version V1.5 (and later versions).

OpenVPN provides two types of tunnels for users to implement VPNS: Routed IP Tunnels and

Bridged Ethernet Tunnels. Here we describe the second type of tunnel. To begin with, check to

make sure that the system has a virtual device /dev/net/tun. If not, issue the following command:

# mknod /dev/net/tun c 10 200

An Ethernet bridge is used to connect different Ethernet networks together. The Ethernets are

bundled into one bigger, “logical” Ethernet. Each Ethernet corresponds to one physical interface

(or port) that is connected to the bridge.

On each OpenVPN machine, you should generate a working directory, such as /etc/openvpn,

where script files and key files reside. Once established, all operations will be performed in that

directory.

Setup 1: Ethernet Bridging for Private Networks on Different Subnets

1. Set up four machines, as shown in the following diagram.

OpenVPN A

OpenVPN B

Host A

eth0: 192.168.2.171

Host B

eth0: 192.168.4.172

ixp0: 192.168.8.174

eth1: 192.168.2.173

local net

InternetInternet

ixp1: 192.168.4.174

eth0: 192.168.8.173

Host A (B) represents one of the machines that belongs to OpenVPN A (B). The two remote

subnets are configured for a different range of IP addresses. When this setup is moved to a

public network, the external interfaces of the OpenVPN machines should be configured for

static IPs, or connect to another device (such as a firewall or DSL box) first.