Senatek LS100 manual Dhcp, Setting IP configuration parameters for Static IP mode

>set ip static 192.168.1.10 255.255.255.0 192.168.1.1

OK

Figure 3-1. Setting IP configuration parameters for Static IP mode

3.2 DHCP

3.2.1 Overview

Dynamic Host Configuration Protocol (DHCP) is a communications protocol that lets network administrators manage and automate the assignment of IP addresses centrally in an organization's network. DHCP lets a network administrator supervise and distribute IP addresses from a central point and automatically send a new IP address when a computer is plugged into a different place in the network.

As described in the section 3.1, the IP address must be entered manually at each computer in Static IP mode and, if computers move to another location in another part of the network, a new IP address must be entered. Meanwhile, all the parameters including the IP address, subnet mask, gateway, DNS servers will be automatically configured when the IP address is assigned in DHCP mode. DHCP uses the concept of a "lease" or amount of time for which a given IP address will be valid for a computer. All the parameters required to assign an IP address are configured on DHCP server side, and each DHCP client computer receives this information when the IP address is provided at its boot-up.

To obtain an IP address, theLS100 sends a corresponding DHCP request as a broadcast over the network after each reset. The reply generated by the DHCP server contains the IP address as well as the subnet mask, gateway address, DNS servers and the lease time. The LS100 immediately places this information in its non-volatile memory. If the operating time reaches the lease time, the LS100 will request the DHCP server for renewal of its lease time. If the DHCP server approves extending the lease, the LS100 can continue to work with the current IP address. Otherwise, the LS100 will start the procedure to request a new IP address to the DHCP server.

A DHCP sever assigns IP addresses dynamically from an IP address pool, which is managed by the network administrator. This means DHCP client, i.e. the LS100, receives a different IP address each time it boots up. To prevent the case that users do not know the IP address of the LS100 in such environments, its IP address should be reserved on the DHCP server side. In order to reserve the IP address in the DHCP network, the administrator needs the MAC address of the LS100 found on the label sticker at the bottom of the LS100:

MAC=00:01:95:04:0c:a1

25