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Chapter 7 APPENDICES
7.1.
Network Configuration Guide
The Lemur control surface is a network device using the Ethernet protocol to connect
and communicate with other devices on the network: Computers, routers, DHCP servers….
Thus you have to setup your Lemur and your network devices properly. Generally, a
device can have multiple network adapters, like Ethernet, WIFI, Airport, USB Network Adapters,
Firewire and others. Each adapter can have its own IP settings and it is highly recommended to
set different sub-networks to avoid network problems.
7.1.1. Glossary
IP Address a unique sequence of 4 numbers witch identify each device on a network. An IP address
can be setup in static mode or attributed dynamically by a DHCP server. An IP address is
composed by 4 numbers between 0 and 255 as follows: 192.168.2.2 or 10.0.0.35.
Network Mask an IP-like sequence witch defines a sub-network of compatible IP addresses.
Most of the time we use 255.255.255.0 or 255.255.0.0, which means that only the 3
or 2 first IP numbers should be equal to be compatible.
Gateway the IP address of the machine giving you access to IPs which are not included in the sub-
network. In brief, a Gateway enables you to gain access to the internet from an intranet.
MAC Address a sequence of 6 numbers identifying each network adapter on a network. The
MAC Address is unique and constant for each device.
7.1.2. Computer directly connected to a Lemur (as known as P2P)
Using a simple crossover RJ45 cable, you can directly connect your Lemur to any computer.
7.1.2.1.
Computer configured as a DHCP Server – Connection Sharing
If your computer is configured as a DHCP Server, it will attribute dynamically an IP
address to the Lemur. Most of the time your computer forces its IP address to 169.254.X.1 and
the Lemur will obtain an IP like 169.254.X.X.
7.1.2.2.
Computer and Lemur using DHCP
When the Lemur and the computer are set up as DHCP clients, they both wait for a
DHCP server until the OS gives a default IP address like 169.254.X.X.
7.1.2.3.
Computer and Lemur using Static IP
The most common way to configure a network without a DHCP server is to set up
each device with different but compatible IPs using the same network mask. Most people use IP
addresses like 192.168.0.X or 10.0.0.X.
Eventually, when using connection sharing, the computer can share its internet
connection and give the Lemur access to another sub-network by using the Gateway Address.