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Configure DHCP server

DHCP Server for EC-S​

  • On Enterprise Connect S locations, you can configure a local DHCP server:
  • Select: Locations > Select the location > VLANs > Expand VPN > DHCP
  • How to get into the ordering process: Order Management

Configure the DHCP parameters​

  • The default DNS server is the Cloud Gateway, but one or two other DNS servers can be configured.
  • You can set DHCP options per location and VLAN/GOI.
  • You can find a list of all DHCP options here.
  • We recommend testing each option in advance, as we cannot guarantee the functionality in every case.

Known DHCP option restrictions​

  • Option 42/General - NTP Server: special characters "=" and "," are not supported and there is no alternative to these characters.
  • Option 42 - NTP Server: ASCII code is not supported.
  • Option 43/60 - Vendor Specific/Class ID: Not supported.
  • Option 55 - Parameter List: All information is always sent to the client. This can lead to problems with the DHCP request.

More information under​

DHCP Server for EC-M/L/XL​

  • The DHCP server allows you to assign an IP address and other parameters to devices connected to the VLAN.
  • The DHCP range must be within the connected IP subnet.
  • A maximum of 5 DHCP ranges can be configured.
  • A maximum pool size of 65,536 addresses can be configured across all VPNs in a location.
  • DHCP options 2 to 254 are supported, except options 3, 6, 15, 44, 46, 50, 51, 52, 53, 54, 55, 57, 58, 59, 61, 82, 120, 121, 184.
  • With DHCP Reservation, IP addresses can be reserved for devices so that they always receive the same IP address. The device identification is based on the MAC address. A maximum of 32 entries can be made.

Configure managed DHCP server​

  1. Under Locations, select the location and open the existing VLAN where the DHCP server should be configured.
  2. Under DHCP, select Managed, enter the DHCP parameters and confirm your entries.
    • For EC-XL locations, different DHCP ranges must be configured between the two CPEs.
  3. If multiple DHCP ranges are required, click + Add DHCP Range.
  4. If required, click + DHCP Option, enter the parameters and confirm your entries.
  5. If IP addresses should be reserved for devices, click + DHCP Reservations, enter the parameters and confirm your entries.
  6. Save your entries and submit the configuration order.

When configuring secondary IP addresses on a subnet, you can select the subnets used for the managed DHCP server:

  • Primary: DHCP range is supported only from the primary subnet.
  • Secondary: DHCP range is supported only from the secondary subnets.
  • Both: DHCP range is supported from both the primary and secondary subnets.

Configure DHCP relay​

To use a central DHCP server outside of the client VLAN, DHCP relay can be configured.

  1. Under Locations, select the location and open the existing VLAN where the DHCP relay should be configured.
  2. Under DHCP, select Relay and add the IP address or IP addresses of the DHCP server.
  3. Save your entries and submit the configuration order.

When configuring secondary IP addresses on a subnet, you can select the gateway address used. The DHCP relay gateway IP address is the IP address of the DHCP relay agent's interface on the same network as the DHCP client. This IP address tells the DHCP server which subnet the client belongs to, allowing the server to provide an appropriate IP address from the correct address pool. If the gateway address is set to None, the primary IP address of the VLAN is used.

DHCPv6 for dual-stack VLANs​

DHCPv6 can be configured for VLANs using IPv4 and IPv6 dual stack. Before configuring DHCPv6, IPv6 must be enabled on the assigned Access VPN and configured on the VLAN. For more information, see:

DHCPv6 availability​

Managed DHCP is not available for IPv6. For IPv6, the following DHCP options are available:

  • Relay: DHCPv6 requests are forwarded to a central DHCPv6 server. When using DHCPv6 relay, configure the IPv6 address of the DHCPv6 server.
  • Disabled: DHCPv6 is not used for the VLAN.

Address assignment for IPv6 clients can be handled by SLAAC. SLAAC allows IPv6 clients to automatically generate their own IPv6 address based on Router Advertisements from the CPE. No managed DHCPv6 server is required for address assignment. SLAAC is configured in the IPv6 settings of the VLAN. For more information, see Configure SLAAC.

Configure DHCPv6 relay​

To use a central DHCPv6 server outside of the client VLAN, DHCPv6 relay can be configured.

  1. Under Locations, select the location and open the existing VLAN where DHCPv6 relay should be configured.
  2. Open the IPv6 configuration of the VLAN.
  3. Under DHCP, select Relay.
  4. Add the IPv6 address of the DHCPv6 server.
  5. Save your entries and submit the configuration order.