This switch includes a Dynamic Host Configuration Protocol (DHCP) server that can assign temporary IP addresses to any attached host requesting service. It can also provide other network settings such as the domain name, default gateway, Domain Name Servers (DNS), Windows Internet Naming Service (WINS) name servers, or information on the bootup file for the host device to download.
Addresses can be assigned to clients from a common address pool configured for a specific IP interface on this switch, or fixed addresses can be assigned to hosts based on the client identifier code or MAC address.
Command Usage
First configure any excluded addresses, including the address for this switch.
Then configure address pools for the network interfaces. You can configure up to 8 network address pools. You can also manually bind an address to a specific client if required. However, any fixed addresses must fall within the range of an existing network address pool. You can configure up to 32 fixed host addresses (i.e., entering one address per pool).
If the DHCP server is running, you must disable it and then reenable it to implement any configuration changes. This can be done on the IP Service > DHCP > Server (Configure Global) page.
Use the IP Service > DHCP > Server (Configure Global) page to enable the DHCP Server.
Enables or disables the DHCP server on this switch. (Default: Disabled)
Use the IP Service > DHCP > Server (Configure Excluded Addresses – Add) page to specify the IP addresses that should not be assigned to clients.
Specifies a single IP address or the first address in a range that the DHCP server should not assign to DHCP clients.
The last address in a range that the DHCP server should not assign to DHCP clients.
Note: Be sure you exclude the address for this switch and other key network devices.
Use the IP Service > DHCP > Server (Configure Pool – Add) page configure IP address pools for each IP interface that will provide addresses to attached clients via the DHCP server.
Command Usage
First configure address pools for the network interfaces. Then you can manually bind an address to a specific client if required. However, note that any static host address must fall within the range of an existing network address pool. You can configure up to 8 network address pools, and up to 32 manually bound host address pools (i.e., one address per host pool).
When a client request is received, the switch first checks for a network address pool matching the gateway where the request originated (i.e., if the request was forwarded by a relay server). If there is no gateway in the client request (i.e., the request was not forwarded by a relay server), the switch searches for a network pool matching the interface through which the client request was received. It then searches for a manually configured host address that falls within the matching network pool. If no manually configured host address is found, it assigns an address from the matching network address pool. However, if no matching address pool is found the request is ignored.
When searching for a manual binding, the switch compares the client identifier and then the hardware address for DHCP clients. Since BOOTP clients cannot transmit a client identifier, you must configure a hardware address for this host type. If no manual binding has been specified for a host entry with a hardware address or client identifier, the switch will assign an address from the first matching network pool.
If the subnet mask is not specified for network or host address pools, the class A, B, or C natural mask is used. The DHCP server assumes that all host addresses are available. You can exclude subsets of the address space by using the IP Service > DHCP > Server (Configure Excluded Addresses - Add) page.
Command Parameters
Creating a New Address Pool -
A string or integer. (Range: 1-32 characters)
Sets the address pool type to Network or Host.
Setting Parameters for a Network Pool -
The IP address of the DHCP address pool.
The bit combination that identifies the network (or subnet) and the host portion of the DHCP address pool.
Setting Parameters for a Static Host -
The IP address to assign to the host.
Specifies the network mask of the client.
A unique designation for the client device, either a text string (1-15 characters) or hexadecimal value. The information included in the identifier is based on RFC 2132 Option 60, and must be unique for all clients in the same administrative domain.
Specifies the MAC address and protocol used on the client. (Options: Ethernet, IEEE802, FDDI, None; Default: Ethernet)
Setting Optional Parameters -
The IP address of the primary and alternate gateway router. The IP address of the router should be on the same subnet as the client.
The IP address of the primary and alternate DNS server. DNS servers must be configured for a DHCP client to map host names to IP addresses.
IP address of the primary and alternate NetBIOS Windows Internet Naming Service (WINS) name server used for Microsoft DHCP clients.
NetBIOS node type for Microsoft DHCP clients. (Options: Broadcast, Hybrid, Mixed, Peer to Peer; Default: Hybrid)
The domain name of the client. (Range: 1-128 characters)
The default boot image for a DHCP client. This file should placed on the Trivial File Transfer Protocol (TFTP) server specified as the Next Server.
The IP address of the next server in the boot process, which is typically a Trivial File Transfer Protocol (TFTP) server.
The duration that an IP address is assigned to a DHCP client. (Options: Finite, Infinite; Default: Infinite)
Use the IP Service > DHCP > Server (Show IP Binding) page display the host devices which have acquired an IP address from this switch’s DHCP server.
IP address assigned to host.
MAC address of host.
Duration that this IP address can be used by the host.
Time this address was assigned by the switch.