RaidSonic IB-NAS4220-B Manuel d'utilisateur télécharger pdf (Page 59)

Manual IB-NAS4220-B

DHCP Server

A DHCP Server allows centralized configuration of all network devices which are set up to

automatically detain an IP-Address. A network device, which has been set to auto

configuration, looks for a DHCP server during start up and asks this server for an IP-

Address. In a home network this service in most cases is provided by the internet access

router (for Example a DSL router). Having two DHCP servers active in a network is

possible but only recommended for professional computer users, knowing exactly what

they are doing.

Attention: Having two DHCP services run in the same network can cause network

failure. Anyone, who does not know how to configure two DHCP servers

correctly, should better deactivate the DHCP Server function of the ICY

BOX, if there is already a DHCP server in the same subnet.

Automatic DHCP configuration

When the IB-NAS4220-B is configured to automatically obtain an IP-Address by DHCP

and it can’t find a DHCP server when starting up, the IB-NAS4220-B assigns itself the

IP-Address 192.168.1.1 with a subnet

mask

255.255.255.0. It also activates

automatically its DHCP Server, distributing IP-Addresses from 192.168.1.2 to

192.168.1.50 with a Maximum Lease Time of 1 day. This behavior ensures an easy auto

configuration of the IB-NAS4220-B in a Network with no auto configuration

infrastructure.

TCP/IP based networks, as the internet, are structured into different network parts called subnets. A subnet is built by a set

of IP Adresses all having the same digital beginning. Remember: an IP Address is always interpreted as 32 bit binary number

containing 32 binary digits. IP Adresses of the same subnet all have the left part of these digits in common. How many of those

digits are used to define a subnet is described by the net mask. Computers in the same subnet are able to communicate

directly together. Computers in different subnets need a so called router which connects different subnets and forwards the net

traffic from one subnet into another.

The net mask defines which part of the IP Address is describing the subnet. Together with the IP Address it is the minimum

necessary part of the network configuration. So it always has to be set appropriate.

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RaidSonic IB-NAS4220-B Manuel d'utilisateur Page 59