Anritsu BTS Master MT8221B, Руководство пользователя

Страница: 111 / 362

LAN and DHCP C-3 DHCP
BTS Master UG PN: 10580-00207 Rev. E C-5
C-3 DHCP
DHCP stands for Dynamic Host Configuration Protocol. It is a protocol that allows a server to
dynamically assign IP addresses to devices that are connected to the network. Most networks
include a DHCP server to manage IP addresses. When a DHCP server is available on the
network, DHCP is the preferred IP address assignment mode.
When using DHCP, no setup is required to lease and use a dynamic IP address. In a dynamic
IP operation, the IP address in use may change from use to use. The DHCP server hands out
IP addresses on a first come, first served basis. As soon as the device is disconnected from the
network, the IP address that it was using becomes available to lease to the next unit that
requests an IP address. Normally, some amount of lag time is present on the DHCP server
end, so if the device is connected again reasonably soon, then it may end up with the same
address.
When a DHCP server is not available, a Static IP address can be used. A Static IP address is
a fixed address. After being set, it will always remain the same, and care must be taken to not
conflict with other equipment on the network.
When using a static IP address on an established network, always request the Static IP
address from the network administrator. Randomly choosing a Static IP address on an
established network may result in duplicate IP addresses or other conflicts.
Three parameters must be set prior to using a Static IP address:
IP Address
This is the Static IP address on the network.
Default Gateway
Often when a static IP address is assigned, a default gateway is also identified. If the
default gateway is unknown, then type in the Static IP address so that the Static IP
address and Default Gateway are the same number.
Subnet Mask
This parameter is usually extracted from the Static IP address based on the class of the
address and determines the destination of any broadcast messages that might be sent
from the instrument. It can be customized if necessary. The subnet mask may also be
provided with the Static IP address.
Note
The MT8221B must be connected to the network before it is turned on in order for
DHCP to function. Key elements of the DHCP lease are performed only during the
instrument startup operations, or when switching from manual to DHCP