User manual

G.shdsl Router User Manual 152

(ping) to the network address of one system. This system is known as the amplifier. The return

address of the ping has been faked (spoofed) to appear to come from a machine on another

network (the victim). The victim is then flooded with responses to the ping. As many responses are

generated for only one attack, the attacker is able use many amplifiers on the same victim.

DHCP

Dynamic Host Configuration Protocol (DHCP) is a communication protocol that lets network

administrators to manage centrally and automate the assignment of Internet Protocol (IP)

addresses in an organization's network. Using the Internet Protocol, each machine that can

connect to the Internet needs a unique IP address. When an organization sets up its computer

users with a connection to the Internet, an IP address must be assigned to each machine.

Without DHCP, the IP address must be entered manually at each computer. If computers move to

another location in another part of the network, a new IP address must be entered. DHCP lets a

network administrator to supervise and distribute IP addresses from a central point and

automatically sends a new IP address when a computer is plugged into a different place in the

network.

To configure DHCP server, move the cursor to

dhcp

and press enter.

generic Configure generic DHCP parameters

fixed Configure fixed host IP address list

list Show DHCP configuration

The generic DHCP parameters can be configured via

generic

command.

active Tigger DHCP function

gateway Default gateway for DHCP client

netmask Subnet mask for DHCP client

ip_range Dynamic assigned IP address range

lease_time Configure max lease time

name_server1 Domain name server1

name_server2 Domain name server2

name_server3 Domain name server3

Active the DHCP function with active command.

Set the default gateway vie

gateway

command.

The subnet mask for DHCP client is configured by

netmask

command.

Ip_range

command is to configure dynamic assigned IP address range.

The dynamic IP maximum lease time is configured by lease_time command.