Amer Networks E5Web GUI - Manual (Page 157)

packets.
Auto is the default behavior.
• Enable DHCP Client
cOS Core includes a DHCP client feature for dynamic assignment of address information by a
connected DHCP server. This feature is often used for receiving external IP address
information from an ISP's DHCP server for public Internet connection.
The information that can be set using DHCP includes the IP and broadcast address of the
interface, the local network that the interface is attached to, and the default gateway.
All addresses received from the DHCP server are assigned to corresponding IP4Address
objects. In this way, dynamically assigned addresses can be used throughout the
configuration in the same way as static addresses. By default, the objects in use are the same
ones as defined in Section 3.1.5, “Auto-Generated Address Objects”. However, the administrator
can specify their own set of address objects if there is a need to modify this behavior.
By default, DHCP is disabled on Ethernet interfaces. If the interface is being used for
connection to the public Internet via an ISP using fixed IP addresses then DHCP shouldn't be
used.
DNS server addresses received through DHCP on an interface named will
be allocated to cOS Core address objects with the names _dns1 and
_dns2.
Note: A gateway IP cannot be deleted with DHCP enabled
If DHCP is enabled for a given Ethernet interface then any gateway IP address that is
defined for that interface cannot be deleted. To remove the gateway address, the
DHCP option must be first disabled.
If DHCP is enabled then there is a set of interface specific advanced settings:
i. A preferred IP address can be requested.
ii. A preferred lease time can be requested.
iii. Static routes can be sent from the DHCP server.
iv. Do not allow IP address collisions with static routes.
v. Do not allow network collisions with static routes.
vi. Specify an allowed IP address for the DHCP lease.
vii. Specify an address range for DHCP servers from which leases will be accepted.
• DHCP Hostname
In some, infrequent cases a DHCP server may require a hostname to be sent by the DHCP
client.
• Enable Transparent Mode
The recommended way to enable Transparent Mode is to add switch routes, as described in
Section 4.8, “Transparent Mode”. An alternative method is to enable transparent mode directly
Chapter 3: Fundamentals
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