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DHCP Server Defaults

Configuration > Networking > DHCP Server Defaults

You can reduce your workload by using this tab to configure global defaults for Dynamic Host Configuration Protocol (DHCP).

  • These defaults apply to the LAN interfaces in Deployment Profiles that specify Router mode.

  • There are three choices:

    • No DHCP.

    • Each LAN interface acts as a DHCP Server.

    • The EdgeConnect appliance acts as a DHCP/BOOTP Relay between a DHCP server at a data center and clients needing an IP address.

  • On the Configuration > Overlays & Security > Deployment Profiles tab, the selected default displays consistently under each LAN–side IP/Mask field.

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    For any LAN–side interface, you can override the global default by clicking the DHCP-related link under the IP/Mask field and changing the values or selection.

  • Changes you save to the global default only apply to new configurations.

  • To view or revise the list of reserved subnets, select Monitoring.

DHCP Settings

DHCP Server

FieldDescription
DHCP Pool Subnet/MaskEnter the DHCP pool subnet and mask IP addresses.
Subnet MaskMask that specifies the default number of IP addresses reserved for any subnet. For example, entering 24 reserves 256 IP addresses.
Exclude first N addressesSpecifies how many IP addresses are not available at the beginning of the subnet’s range.
Exclude last N addressesSpecifies how many IP addresses are not available at the end of the subnet’s range.
Default lease,
Maximum lease
Specify, in hours, how long an interface can keep a DHCP–assigned IP address.
Default gatewayIndicates whether the default gateway is being used.
DNS server(s)Specifies the associated Domain Name System servers.
NTP server(s)Specifies the associated Network Time Protocol servers.
NetBIOS name server(s)Used for Windows (SMB) type sharing and messaging. It resolves the names when you are mapping a drive or connecting to a printer.
NetBIOS node typeNetBIOS node type of a networked computer relates to how it resolves NetBIOS names to IP addresses. There are four node types:

B-node – 0x01 Broadcast

P-node – 0x02 Peer (WINS only)

M-node – 0x04 Mixed (broadcast, then WINS)

H-node – 0x08 Hybrid (WINS, then broadcast)
DHCP failoverEnables DHCP failover. To set it up, click the Failover Settings link.

DHCP/BOOTP Relay

FieldDescription
Destination DHCP/BOOTP ServerIP address of the DHCP server assigning the IP addresses.
Enable Option 82When selected, inserts additional information into the packet header to identify the client’s point of attachment. This setting applies to all LAN-side interfaces on this appliance.

IMPORTANT: Changing this setting will modify Option 82 settings on all LAN-side interfaces that are enabled as DHCP Relay.
Option 82 PolicyTells the relay what to do with the hex string it receives. The choices are append, replace, forward, and discard. This setting applies to all LAN-sideinterfaces on this appliance.

IMPORTANT: Changing this setting will modify Option 82 settings on all LAN-side interfaces that are enabled as DHCP Relay.

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