Chapter 18: Ip Configuration; Overview - Cisco Small Business 200 Series Administration Manual

IP Configuration
IP interface addresses can be configured manually by the user, or automatically configured by a DHCP
server. This section provides information for defining the device IP addresses, either manually or by making
the device a DHCP client.
This section covers the following topics:
•

Overview

• IPv4 Management and Interfaces
• Domain Name
Overview
Layer 2 IP Addressing
The device has up to one IPv4 address and up to two IPv6 interfaces (either "native" interface or Tunnel) in
the management VLAN. This IP address and the default gateway can be configured manually, or by DHCP.
The static IP address and default gateway are configured on the IPv4 Interface page. The device uses the
default gateway, if configured, to communicate with devices that are not in the same IP subnet as the
device. By default, VLAN 1 is the management VLAN, but this can be modified. The device can only be
reached at the configured IP address through its management VLAN.
The factory default setting of the IPv4 address configuration is DHCPv4. This means that the device acts as
a DHCPv4 client, and sends out a DHCPv4 request during boot up.
If the device receives a DHCPv4 response from the DHCPv4 server with an IPv4 address, it sends Address
Resolution Protocol (ARP) packets to confirm that the IP address is unique. If the ARP response shows that
the IPv4 address is in use, the device sends a DHCPDECLINE message to the offering DHCP server, and
sends another DHCPDISCOVER packet that restarts the process.
If the device does not receive a DHCPv4 response in 60 seconds, it continues to send DHCPDISCOVER
queries, and adopts the default IPv4 address: 192.168.1.254/24.
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