ExtremeIQ Cloud

View, add, and modify DHCP (dynamic host configuration protocol) server and relay objects. View, add, sort, select, modify, and delete IP pool objects. View, add, sort, select, modify, and delete custom DHCP option objects. Save device setting changes, and optionally update the device immediately.

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Configure > Common Objects > Basic > DHCP Server and Relay > DHCP_server_and_relay_name

Manage > Devices > device_name > Additional Device Settings > DHCP Server and Relay > Add

About DHCP Servers

For small networks that do not already have a DHCP server, you can configure and enable a DHCP server on an Extreme Networks device to provide network settings dynamically to clients. After you configure one hive member as a DHCP server, the other hive members process the DHCPDISCOVERY and DHCPREQUEST messages that they receive from clients as usual, forwarding them to their neighbors through which they connect to the network. The only requirement about which device to use as the DHCP server is that it must be a portal. See DHCP Servers and DHCP Relays.

When all the hive members are in the same subnet and all devices in that subnet are on a single VLAN, you only need to configure the device that you want to be the DHCP server with a pool of IP addresses from which it can draw when responding to DHCP client requests.

When some hive members are in a different subnet from that of the DHCP server, you must also configure those devices to forward DHCP traffic to the IP address of the DHCP server. In this case, the other devices act as DHCP relay agents. You can configure both DHCP servers and relay agents here.

DHCP Server and Relay

View, enter, modify, or select the following for a DHCP server and relay object:

Name: The name for each DHCP server and relay agent object.

Description: Enter an optional description.

Interface: The name of the interface (mgt0) or subinterface (mgt0, mgt0.1, mgt0.2, ...) on which the DHCP server or relay agent is set.

Service: Select DHCP server or DHCP relay agent.

The DHCP relay enhancement supports deployments when a centralized DHCP server (for example, at corporate headquarters) is used. When you enable DHCP Relay, then the DHCP server feature on devices is disabled so that routers redirect DHCP service requests to the centralized DHCP server.

Set the DHCP server as authoritative: Enable or disable whether this DHCP server is authoritative. If this DHCP server is the only one on your network, it knows what the valid IP numbers on the network are. If a client tries to register with an invalid IP address (for example, if a client device sill has an active lease with another network), an authoritative DHCP server denies access to that client. Select the check box to set the DHCP server as authoritative or clear it to set the DHCP server as non-authoritative (default).

Use ARP to check for IP address conflicts: Enable (default) when this DHCP server uses ARP to check for IP address conflicts on the network before assigning an IP address to a DHCP client. Clear the check box to disable this feature.

Enable NAT Support: Enable or disable whether this DHCP server uses NAT.

IP Pool: Define the IP address pool from which the DHCP server draws IP addresses when making assignments. You can also use IPv6 addresses. To add each new IP pool select , enter the start and end IP addresses, and then select Add. To delete an IP pool, select it from the list, and then select .

Configure DHCP Server Options

Configure each of the required parameters that the DHCP server will return to clients along with an IP address. You can use IPv4 or IPv6 addresses.

Default Gateway: Enter the IP address of the default gateway for the subnet to which the addresses in the IP pool belong.

DNS Server1 IP: Enter the IP address of the primary DNS server for clients to contact when resolving domain names to IP addresses (DHCP option 6).

DNS Server2 IP: Enter the IP address of the secondary DNS server for clients to contact when resolving domain names to IP addresses and the primary DNS server is unresponsive (DHCP option 6).

DNS Server3 IP: Enter the IP address of the tertiary DNS server for clients to use when resolving domain names to IP addresses if neither the primary nor secondary DNS servers respond (DHCP option 6).

POP3 Server IP: Enter the IP address of the POP3 (Post Office Protocol v3) server for clients to use (DHCP option 70).

SMTP Server IP: Enter the IP address of the SMTP (Simple Mail Transfer Protocol) server for clients to use (DHCP option 69).

WINS Server1 IP: Enter the IP address of the primary WINS (Windows Internet Name Service) server for NetBIOS name-to-address resolution (DHCP option 44).

WINS Server2 IP: Enter the IP address of the secondary WINS (Windows Internet Name Service) server for NetBIOS name-to-address resolution (DHCP option 44).

Lease Time: Enter the length of time (60-86400000 seconds) for the DHCP lease to last; by default, DHCP leases last for 86,400 seconds, or 24 hours (DHCP option 51).

Netmask: Enter the netmask defining the subnet to which the addresses in the IP pool belong.

Domain Name: Enter the domain name (0-32 characters) to assign to DHCP clients; this is the default domain name for DNS name resolution (DHCP option 15).

MTU: Set the path MTU aging timeout in seconds for clients to use; the minimum value is 68 seconds, and the maximum is 8192 seconds (DHCP option 24).

NTP Server1 IP: Enter the IP address of the primary NTP (Network Time Protocol) server with which DHCP clients can synchronize their clocks (DHCP option 42).

NTP Server2 IP: Enter the IP address of the secondary NTP (Network Time Protocol) server with which DHCP clients can synchronize their clocks (DHCP option 42).

Log Server IP: Enter the IP address of the logging server for DHCP clients (DHCP option 7).

Configure Custom DHCP Options

Define custom DHCP options to provide additional network settings to connected clients. You can use IPv4 or IPv6 addresses.

To add each new custom DHCP option select . Enter the number in the Number field, select Integer, IP Address, String, or Hex in the Type drop-down menu, and then select Add. To delete a custom DHCP option, select it from the list, and then select .

Number: Enter a custom option number from 2 to 5, 8 to 14, 16 to 25, 27 to 41, 43, 45 to 50, 52 to 57, 60 to 68, 71 to 224, 227, 228, or from 232 to 254.

Note

The following DHCP option numbers are reserved: 226, ExtremeCloud IQ domain name; 225, ExtremeCloud IQ IP address; 229, PPSK server IP address; 230, RADIUS server authentication IP address; 231, RADIUS server accounting IP address. The following DHCP option numbers are reserved for other information: 3, 6, 7, 15, 26, 42, 44, 51, 58, 59, 69, and 70.

Type: Choose the type of data that the option will provide:

Integer: (0-2,147,483,547)

IP Address: (Four octets for an IP address or eight groups of two octets each for an IPv6 address.)

String: (1-255 characters)

Hex: (1-254 hexadecimal digits)

When you are finished, select Save. You can update the device immediately by selecting Update Now. In the Device Update dialog box, select the type of update, and then select Save as Defaults and, to update the device immediately select Perform Update.