Alcatel-Lucent 9500 MXC, Руководство пользователя

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9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-10-15
• In the unlikely situation where interface addressing has been selected
(Advanced) and multiple interfaces have been assigned a LAN compatible
address, the DHCP address range must not include the addresses assigned to
these interfaces.
• The DHCP address range must not include 192.168.255.0 to 192.168.255.255
as they are used for internal (embedded) addressing within 9500 MXC.
Configuring The DHCP Server
Configuring the DHCP server only requires it to be enabled and a valid address
range established. An address range specifies the range of IP addresses that a
server has available to assign to devices that are connected to it, in this case the
address range available to CT PCs.
As the number of CT PCs likely to be connected to the NMS LAN at a 9500
MXC site is small, the address range can be kept small. Bear in mind that if all
addresses are assigned, a subsequent CT PC
DHCP
3
connection will not be
possible - not until the lease-time on an issued address expires (nominally 30
seconds after an assignment disconnection).
When considering the address range, bear in mind that where there are two or
more 9500 MXC devices on the NMS LAN, such as a protected IDU pairing or
back-to-back INU/IDUs, the server address range should be different and
non-overlapping, so that there is no potential for the devices trying to issue the
same IP address. While this is unlikely to cause a problem for a CT connection,
good practice dictates that each device should support a unique range of
addresses.
On the other hand, the range of addresses is typically large for the number of
different CT PCs that are ever likely to be connected within the lease time. There
will normally be a minimum of 253 LAN-specific IP addresses
4
available so
even if the address range is extended to 10 IP addresses per 9500 MXC device,
there is no potential for insufficient address availability, either to issue or being
available for CT PC connection.
Figure 10-5 shows a typical Networking screen and its DHCP server
configuration prompts.
• The IP address range is set to provide a non-overlapping range with any other
LAN-connected and DHCP-enabled 9500 MXC radios.
• A green tick indicates a valid range setting.
3
It would still be possible to secure an Ethernet connection by entering a LAN compatible address in the
TCP/IP properties window on your CT PC, providing the address entered was not the same as an address
assigned to another currently connected PC.
4
The host portion of an IP address will normally have 253 possible addresses; 255 less 2.