Amer Networks E5Web GUI - Manual (Page 156)

Each Ethernet interface is required to have an Interface IP Address, which can be either a static
address or an address provided by DHCP. The interface IP address is used as the primary
address for communicating with the system through the specific Ethernet interface.
cOS Core IP4 Address objects are usually used to define the IPv4 addresses of Ethernet
interfaces. Those objects are normally auto-generated by the system. For more information,
please see Section 3.1.5, “Auto-Generated Address Objects”. When the system is first started, all
unconfigured Ethernet interfaces will be assigned default addresses from the localhost
sub-network (127.0.0.0/8).
Tip: Specifying multiple IP addresses on an interface
Multiple IP addresses can be specified for an Ethernet interface by using the ARP
Publish feature. (For more information, see Section 3.5, “ARP”).
• Network
In addition to the interface IP address, a Network address is also specified for an Ethernet
interface. The Network address provides information to cOS Core about what IP addresses are
directly reachable through the interface. In other words, those residing on the same LAN
segment as the interface itself. In the routing table associated with the interface, cOS Core
will automatically create a direct route to the specified network over the actual interface.
• Default Gateway
A Default Gateway address can optionally be specified for an Ethernet interface. This is
normally the address of a router and very often the router which acts as the gateway to the
Internet.
When a default gateway is specified then, by default, a route to the network all-nets is
automatically created in the cOS Core routing table for the interface. This means that any
traffic which does not have a more specific matching route will be sent via that interface to
the default gateway. This behavior can be changed by disabling an interface's advanced
option for creating the default route automatically.
Normally, only one default all-nets route to the default gateway needs to exist in the routing
table.
Note: The all-nets IP address object
The all-nets IP object (IP address: 0.0.0.0/0) includes the multicast IP address range
(224.0.0.0 => 239.255.255.255). For more information about this topic, see
Section 4.7, “Multicast Routing”.
• Receive Multicast Traffic
This option controls the reception of multicast IP packets on that interface. There are three
options available for multicast packet handling:
i. Off - Multicast packets are silently dropped.
ii. On - Multicast traffic can always be received by the interface.
iii. Auto - If an IP rule exists in the rule set which applies to a multicast packet's destination
IP address, then the Ethernet interface is automatically enabled to receive multicast
Chapter 3: Fundamentals
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