4.1.2 System IP Configuration

The Configuration > System > IP is used to configure unit IP/DHCP, Default-gateway, DNS, management VLAN, and so on.

Figure 4-2. IP Configuration

The list of parameters is as follows:

  • Domain name: The name string of local domain where the device belongs
    • No Domain Name: No domain name is used
    • Configured Domain Name: Explicitly specify the name of local domain
    • From any DHCPv6 interfaces: The first domain name offered from a DHCPv6 lease to a DHCPv6-enabled interface is used
    • From this DHCPv6 interface: Specify from which DHCPv6-enabled interface a provided domain name is preferred
  • DNS Servers: Controls the DNS name resolution done by the switch. Index #1 has the highest priority.
    • No DNS server: No DNS server is used
    • Configured IPv4/IPv6: Explicitly provide the valid IPv4/v6 unicast address of the DNS Server. Ensure that the configured DNS server is reachable (for example, through PING) for activating DNS service.
    • From this DHCPv4/v6 interface: Specify from which DHCPv4-enabled interface a provided DNS server must be preferred
    • From any DHCPv4/v6 interface: The first DNS server offered from a DHCPv4/v6 lease to a DHCPv4/v6-enabled interface is used
  • DNS Proxy: When DNS proxy is enabled, the system relays DNS requests to the currently configured DNS server and replies as a DNS resolver to the client devices on the network. Currently, only IPv4 DNS proxy is supported.
  • Delete: Select this option to delete an existing IP interface
  • VLAN: The VLAN associated with the IP interface. Only ports in this VLAN can access the IP interface. This field is only available for input when creating a new interface.
  • DHCPv4 Enable: Enable the DHCPv4 client by checking this box. If this option is enabled, the system configures the IPv4 address and mask of the interface using the DHCPv4 protocol.
  • IPv4 DHCP Client Identifier Type: This specifies which of the following three types are used for the Client Identifier. See RFC-2132 section 9.14.
    • IfMac: This is the interface name of DHCP client identifier. When the DHCPv4 client is enabled and the client identifier type is ifmac, then the configured interface's hardware MAC address is used in the DHCP option 61 field.
    • ASCII: This is the ASCII string of DHCP client identifier. When the DHCPv4 client is enabled and the client identifier type is ascii, the ASCII string is used in the DHCP option 61 field.
    • HEX: This is the hexadecimal string of DHCP client identifier. When the DHCPv4 client is enabled and the client identifier type hex, the hexadecimal value is used in the DHCP option 61 field.
  • IPv4 DHCP Hostname: The hostname of DHCP client. If the DHCPv4 client is enabled, the configured hostname is used in the DHCP option 12 field. When this value is empty string, the field uses the configured system name and the latest three bytes of system MAC addresses as the hostname.
  • IPv4 DHCP Fallback Timeout: The number of seconds for trying to obtain a DHCP lease. After this period expires, a configured IPv4 address is used as IPv4 interface address. A value of zero disables the fallback mechanism, such that DHCP keeps retrying until a valid lease is obtained. Legal values are 0 to 4294967295 seconds.
  • IPv4 DHCP Current Lease: For DHCP interfaces with an active lease, this column shows the current interface address, as provided by the DHCP server.
  • IPv4 Address: This is the IPv4 address of the interface. If DHCP is enabled, then this field configures the fallback address. The field may be left blank if IPv4 operation on the interface is not desired or no DHCP fallback address is desired.
  • IPv4 Mask: The IPv4 network mask, in number of bits (prefix length). Valid values are between 0 and 30 bits for an IPv4 address. If DHCP is enabled, then this field configures the fallback address network mask. The field may be left blank if IPv4 operation on the interface is not desired or no DHCP fallback address is desired.
  • DHCPv6 Enable: Enable the DHCPv6 client by checking this box. If this option is enabled, then the system configures the IPv6 address of the interface using the DHCPv6 protocol.
  • DHCPv6 Rapid Commit: Enable the DHCPv6 Rapid-Commit option by selecting this box. If this option is enabled, then the DHCPv6 client terminates the waiting process as soon as a Reply message with a Rapid Commit option is received. This option is only manageable when DHCPv6 client is enabled.
  • DHCPv6 Current Lease: For DHCPv6 interface with an active lease, this column shows the interface address provided by the DHCPv6 server.
  • IPv6 Address: The IPv6 address of the interface. A IPv6 address is in 128-bit records represented as eight fields of up to four hexadecimal digits with a colon separating each field (:).

    For example, fe80::215:c5ff:fe03:4dc7. The symbol :: is a special syntax that is used as a shorthand way of representing multiple 16-bit groups of contiguous zeros; but it can appear only once.

    System accepts the valid IPv6 unicast address only, except IPv4-Compatible address and IPv4-Mapped address. The field might be left blank if IPv6 operation on the interface is not desired.

  • IPv6 Mask: The IPv6 network mask, in number of bits (prefix length). Valid values are between 1-bit and 128 bits for an IPv6 address. The field might be left blank if IPv6 operation on the interface is not desired.