Network Settings

The following tables list the configurable EMS Network settings.

Note

Please contact your Network Administrator if you are unsure what to put in any of these fields or if you are unsure whether the setting is required on your network.

General

Setting	Description
Hostname	The hostname to be assigned to the server. Specify the hostname as a fully-qualified domain name (FQDN). For example: myserver.mycompany.com.
Default Interface	The default Ethernet interface: Select an available interface, such as eth0, eth1, em1, or em2. Note Network Interface names for Ethernet interfaces may vary, such as eth0/eth1/… or em1/em2/…. "None" indicates that the default interface is not set.
NTP Server	(Optional) If Network Time Protocol (NTP) is enabled, enter the IP address of the NTP server.
DNS Servers	(Optional) The Internet Protocol (IP) addresses of the Domain Name Servers to use.
Search Domains	(Optional) The search strings to use when attempting to resolve domain names.
SNMP	Enable/Disable Simple Network Management Protocol (SNMP).
Read-Only Community	SNMP string to be used when making read-only information requests.
SNMP Trap Servers	IPv4 or FQDN of a server and the Community Name to send SNMP traps to.

Interfaces - IPv4

Setting	Description
em1\|em2\|idrac	Allows for multiple interfaces. Select the interface tab to view and configure. Note Network Interface names for Ethernet interfaces may vary, such as eth0/eth1/…, pNp1/pNp2/…, or em1/em2/….
Bond Interface	Bonding enables an administrator to use more than one physical network port as a single connection. This can be used to increase performance or redundancy of a server. See the Bonding Mode entry in this table.
Addressing	Choose whether the interface uses a static or dynamic IP address: None – Select to disable the interface. Static – Select to disable DHCP. When it is disabled, you must manually enter the IP address and subnet mask. DHCP – Select to enable the Dynamic Host Configuration Protocol. When DNCP is enabled, the appliance will receive and IP address from a DHCP server on the network.
IP Address	The IP Address for the interface. This is a unique address that identifies the unit in the IP network. If DHCP is disabled, you may enter an IP address in dotted-decimal format (xxx.xxx.xxx.xxx).
Subnet Mask	This is a 32-bit mask used to divide an IP address into subnets and specify the network’s available hosts. If DHCP is disabled, you may enter a Network Mask in dotted-decimal format (e.g., 255.255.0.0).
Gateway	The IPv4 default route to be assigned to the interface. This is the gateway that is used when no other route matches. This address must be reachable on your local subnet. If DHCP is disabled, you may enter a gateway address in dotted-decimal format.
MTU	(Maximum Transmission Unit) Specifies the maximum allowed size of IP packets for the outgoing data stream. 228..1500
MAC Address	(Read-only) The Media Access Control address assigned to the interface. This is the physical address of the network interface and cannot be changed.
Link	Select the link negotiation settings for the interface, either Auto or Manual. If you select Manual, you can select the Speed (10, 100 or 1000) and Duplex setting (Full or Half).
Bonding Mode	(Bond Interface only) Modes for the Linux bonding driver determine the way in which traffic sent out of the bonded interface is actually dispersed over the real interfaces. Modes 0, 1, and 2 are by far the most commonly used among them. Round Robin Sequential: Transmits packets in first available network interface (NIC) slave through the last. This mode provides load balancing and fault tolerance. Active Backup: Only one NIC slave in the bond is active at a time. A different slave becomes active only when the active slave fails. This mode provides fault tolerance XOR Sequential: Transmits based on XOR formula. (Source MAC address is XOR’d with destination MAC address). This mode selects the same NIC slave for each destination MAC address and provides load balancing and fault tolerance. Broadcast – Fault Tolerance: Transmits network packets on all slave interfaces. This mode is least used (only for specific purpose) and provides only fault tolerance. IEEE 802.3ad Dynamic Link Aggregation: Creates aggregation groups that share the same speed and duplex settings. Utilizes all slave network interfaces in the active aggregator group according to the 802.3ad specification. This mode is similar to the XOR mode above and supports the same balancing policies. The link is set up dynamically between two LACP-supporting peers. (Adaptive) Transmit Load Balancing (TLB): The outgoing traffic is distributed according to the current load and queue on each slave interface. Incoming traffic is received by one currently designated slave network interface. If this receiving slave fails, another slave takes over the MAC address of the failed receiving slave. (Adaptive) Active Load Balancing (ALB): This includes balance-tlb + receive load balancing (rlb) for IPV4 traffic. The receive load balancing is achieved by ARP negotiation. The bonding driver intercepts the ARP Replies sent by the server on their way out and overwrites the source hardware address with the unique hardware address of one of the slaves in the bond such that different clients use different hardware addresses for the server.
Slave Interfaces	(Bond Interface only) Select the checkboxes next to the interfaces to enslave it to the bond interface.

Interfaces - IPv6

Setting	Description
Addressing	Select one of the following options to obtain an IPv6 address for the unit: Automatic: Uses SLAAC (Stateless Address Autoconfiguration) to obtain IP addresses automatically without the need for a DHCP server Automatic (DHCP): Enables the Dynamic Host Configuration Protocol to get an IP address from a DHCP server on the network Static: Use to manually configure the device’s IP and gateway addresses.
Global IPv6 Address	If Automatic addressing is used, displays the IPv6 Address (with a `/128` suffix). This is a unique address that identifies the unit in the IP network. If Static addressing is used, enter an IPv6 address in hexadecimal notation.
Subnet Prefix Length	(Static addressing only) The Prefix Length in IPv6 is the equivalent of the Subnet Mask in IPv4. However, instead of being expressed in four octets as it is in IPv4, it is expressed as an integer between 1 through 128.
Gateway	If Automatic addressing is used, displays the gateway address of the network (typically the address of the network router). If Static addressing is used, enter a gateway address in hexadecimal notation.
Link-Local IPv6 Address	(Read-only) A link-local address is an Internet Protocol (IP) unicast address intended to be used only to connect to the hosts on the same network. A link-local address starts with `fe80:` and is always automatically assigned.
Enable Privacy Extensions	(Automatic addressing only) Check this checkbox to enable SLAAC Privacy Extensions. As documented in RFC 4941 "Privacy Extensions for Stateless Address Autoconfiguration in IPv6", this entails using randomly generated, temporary, global scope IPv6 addresses that are regularly discarded and replaced with different addresses.
Duplicate Address Detection	Check this checkbox to automatically detect if your Link-Local IPv6 address is a duplicate of one already in use. If so, the Link-Local IPv6 Address changes to a unique address. See RFC 4862 "IPv6 Stateless Address Autoconfiguration" for more details.

Static Routes

Setting	Description
Protocol	Select whether the route is an IPv4 or IPv6 address.
Destination	Each static route requires a destination.
Subnet Mask	This is a 32-bit subnet mask used to divide an IP address into subnets and specify the network's available hosts. If DHCP is disabled, you may enter the Network Mask in dotted-decimal format (e.g., 255.255.0.0).
Gateway	This is the gateway that is used when no other gateway matches. This address must be reachable on your local subnet. If DHCP is disabled, you may enter the gateway address in dotted-decimal format.
Interface	The interface associated with the static route. Use the drop-down menu to make your selection.