DHCP Client

This section describes how to configure the Dynamic Host Configuration Protocol Client on the switch.

DHCP Client (Dynamic Host Configuration Protocol Client) client uses DHCP to temporarily receive a unique IP address for it from the DHCP server. It also receives other network configuration information, such as default gateway, from the DHCP server.

To access DHCP Client screens, go to Layer 3 Management > DHCP Client.

Enabling DHCP Client

By default, the tab DHCPC Option Type displays the DHCP Option Types Settings screen.

Figure 1. DHCP Client Global Configuration

Screen Objective	This screen allows the user to enable the DHCP Client functionality.

Navigation	Layer 3 Management > DHCP Client > Global Configuration
Fields	Global Status—select either enabled or disabled.
Buttons	Apply—modifies attributes and saves the changes.

DHCP Option Type Settings

Figure 2. DHCP Option Type Settings

Screen Objective	This screen allows the user to configure basic DHCP Relay information.
Note: To enable DHCP Relay, DHCP Server Status should be disabled.
Navigation	Layer 3 Management > DHCP Server > DHCP Option Type
Fields	Select—click to select an interface for which DHCP option type configuration needs to be modified or deleted. Interface Name—select an interface for which DHCP option type settings to be configured from the list of VLAN interfaces already created in the system.
Fields	Option Type/ DHCP Option Type—select the DHCP Client Option Type for the specified interface created in the system. The list contains: TFTP Server Name (IP Format/String)—sends the TFTP requests to get the TFTP server’s domain name Bootfile Name (String)—sends the DHCP requests to get the boot File Name. Vendor Specific (String)—sends the DHCP requests to get the Vendor Specific details. NTP Servers (IP Format)—sends the DHCP requests to get the NTP server IP. DNS Servers (IP Format)—sends the DHCP requests to get the DNS server IP. SIP Servers (IP Format/String)—sends the DHCP requests to get the SIP server information. Option 240—sends the DHCP requests to get the Option 240 information. Option Code/DHCP Option Code—displays the Option code for the specified interface created in the system. When option code is displayed as: 66—indicates TFTP Server Name (IP Format/String) is set. This allows to identify a TFTP server when the same field in the DHCP header is used for DHCP options 67—indicates Bootfile Name (String) is set. This allows identifying a bootfile when the file field in the DHCP header is used for DHCP options. 0—indicates no option type is set for the interface 60—indicates Vendor Specific (String) is set. This allows identifying a vendor specific when the file field in the DHCP header is used for DHCP options. 42—indicates NTP Servers (IP Format) is set. This allows identifying NTP Servers when the file field in the DHCP header is used for DHCP options. 6—indicates DNS Servers (IP Format) is set. This allows identifying a DNS Servers when the file field in the DHCP header is used for DHCP options. 120—indicates SIP Servers (IP Format/String) is set. This allows identifying SIP Servers when the file field in the DHCP header is used for DHCP options. 240—indicates Option 240 is set. This allows identifying Option 240 when the file field in the DHCP header is used for DHCP options. 0—indicates no option type is set for the interface. Option Value/DHCP Option Value—enter an value to identify the octets of data, of length specified by length for that entry. This value will be taken from DHCP ACK message which is sent from server to client. Note: This field is enabled only when DHCP Option Type is set as Vendor Specific (String).
Buttons	Create—adds and saves new configuration. Reset—resets to default value for respective fields and discards all user input. Apply—modifies attributes and saves the changes. Delete—deletes the selected entry.

DHCP Client Identifier Setting

Figure 3. DHCP Client Identifier Setting

Screen Objective	This screen allows the user to configure DHCP client identifiers for the interfaces created in the system. The client identifier is advertised in the DHCP control packets.
Navigation	Layer 3 Management > DHCP Server > DHCPC Client ID
Fields	Select—select the interface for which configuration need to be applied or deleted. Interface Name—select an interface for which DHCP option type settings need to be configured from the list of VLAN interfaces already created in the system. Client Identifier—enter the unique identifier of DHCP client for the specified interface created in the system. Client ID is used in all DHCP client messages. This identifier will be used in DHCP server to maintain client information. This identifier can be mac address or any string Note: String of length zero will reset the configuration. Remote ID—enter the Remote ID value for an interface. The configured remote ID is used to inform the DHCP client about the remote circuit to which the DHCP packets should be forwarded from the interface. The remote ID is globally unique and an octet string of maximum size of 32. Note: Set Get IP Address Mode as DHCP using the link Layer 3 Management > IP > IPv4 Address Configuration to access Get IP Address Mode screen Note: VLAN 1 should not be used as it is used to connect web session. If in case VLAN 1 is used, connectivity to the web will be lost.
Buttons	Add—adds and saves new configuration. Reset—resets to default value for respective fields and discards all user input.