QNAP

QTS 5.0.x

Configuring DHCP Server Settings

The Dynamic Host Configuration Protocol (DHCP) allows devices in a TCP/UDP network to be automatically configured for the network as the device is booted. The DHCP service uses a client-server mechanism, wherein a DHCP server stores and manages network configuration information for clients and offers necessary data when a client requests the information. The information includes the IP address and subnet mask, the IP address of the default gateway, the DNS server IP address, and the IP lease information.

Important:

Do not create a new DHCP server if one already exists on the network. Enabling multiple DHCP servers on the same network can cause IP address conflicts or network access errors.

  1. Go to Control Panel > Network & File Services > Network & Virtual Switch.

    The Network & Virtual Switch window opens.

  2. Go to Network > DHCP Server.
  3. Click Add.

    The DHCP Server window opens.

  4. Select an interface.
  5. Click Next.
  6. Select the network environment for the DHCP server.

    Option

    Description

    Enable DHCP server on the current network.

    • The adapter keeps the existing IP address and subnet mask.

    • The DHCP server shares the subnet mask with the adapter and is assigned the next available IP address.

    Reassign an IP address to the adapter and enable a DHCP server on a new subnet.

    • The adapter is assigned a new IP address and subnet mask.

    • The DHCP server uses a different subnet mask and IP address.

    Enable DHCP server for another subnet.

    • The adapter keeps the existing IP address and subnet mask.

    • The DHCP server uses a different subnet mask and IP address.

  7. Click Next.
  8. Configure a static IP address for the adapter.
    Important:

    A static IP address must be configured when creating a DHCP server.

    1. Click Yes.
    2. Configure IP address settings.

      Setting

      Description

      Fixed IP Address

      Specify a fixed IP address.

      Tip:

      Examine your network setup for guidance on how to best configure these settings.

      Subnet Mask

      Specify the subnet mask used to subdivide your IP address.

      Default Gateway

      Specify the IP address of the default gateway for the adapter.

      Jumbo Frame

      Jumbo Frames are Ethernet frames that are larger than 1500 bytes. They are designed to enhance Ethernet networking throughput, and to reduce CPU usage when transferring large files. QTS supports the following Jumbo Frame sizes:
      • 1500 bytes (default)

      • 4074 bytes

      • 7418 bytes

      • 9000 bytes

      Important:
      • Jumbo Frames are only supported by certain NAS models.

      • Using Jumbo Frames requires a network speed of 1000 Mbps or faster. All connected network devices must enable Jumbo Frames and use the same MTU size.

      Network Speed

      Specify the speed at which the adapter will operate.

      Tip:

      Auto-negotiation will automatically detect and set the transfer rate.

      Primary DNS Server

      Assign an IP address for the primary DNS server.

      Secondary DNS server

      Assign an IP address for the secondary DNS server.

      Important:

      QNAP recommends specifying at least one DNS server to allow URL lookups.

    3. Click Next.
  9. Configure DHCP settings.

    Setting

    Description

    Start IP Address

    Specify the starting IP address in a range allocated to DHCP clients.

    End IP Address

    Specify the ending IP addresses in a range allocated to DHCP clients.

    Subnet Mask

    Specify the subnet mask used to subdivide your IP address.

    Lease Time

    Specify the length of time that an IP address is reserved for a DHCP client. The IP address is made available to other clients when the lease expires.

    Default Gateway

    Specify the IP address of the default gateway for the DHCP server.

    Primary DNS Server

    Specify a DNS server for the DHCP server.

    Secondary DNS Server

    Specify a secondary DNS server for the DHCP server.

    Important:

    QNAP recommends specifying at least one DNS server to allow URL lookups.

    WINS Server

    Specify the WINS server IP address.

    Tip:

    Windows Internet Naming Service (WINS) converts computer names (NetBIOS names) to IP addresses, allowing Windows computers on a network to easily find and communicate with each other.

    DNS Suffix

    Specify the DNS suffix.

    Tip:

    The DNS suffix is used for resolving unqualified or incomplete host names.

    TFTP Server

    Specify the public IP address for the TFTP server.

    Tip:

    QTS supports both PXE and remote booting of devices.

    Boot File

    Specify location and file name of the TFTP server boot file.

    Tip:

    QTS supports both PXE and remote booting of devices.

  10. Click Apply.

Network & Virtual Switch adds the DHCP server.