User`s manual

UC-7112-LX Plus Software User’s Manual Managing Communications
4-19
SNMP
The UC-7112-LX Plus has built-in SNMP V1 (Simple Network Management Protocol) agent
software. It supports RFC1317 RS-232 like group and RFC 1213 MIB-II.
See Appendix B for a simple example that allows you to use an SNMP browser on the host site to
query the UC-7112-LX Plus, which is the SNMP agent. The UC-7112-LX Plus will respond.
NOTE Click on the following links for more information about MIB II and RS-232 like groups:
http://www.faqs.org/rfcs/rfc121
3.html
http://www.faqs.org/rfcs/rfc131
7.html
Æ UC-7112-LX Plus does NOT support SNMP trap.
OpenVPN
OpenVPN provides two types of tunnels for users to implement VPNS: Routed IP Tunnels and
Bridged Ethernet Tunnels. 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
LAN1: 192.168.2.171
Host B
LAN1: 192.168.4.172
LAN1: 192.168.8.174
LAN1: 192.168.2.173
local net
local net
tenretnI tenretnI
LAN2: 192.168.4.174
LAN2: 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.
# openvpn --genkey --secret secrouter.key