Installation Instructions

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COMPANY CONFIDENTIAL CENG0336_XE_nanoBTS_Installation_and_Test_Manual.doc
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6.6 The DHCP Server
6.6.1 Function of the DHCP server
The DHCP server can supply the following information to a nanoBTS which does not
have an IP configuration:
• IP address
• subnet mask
• default gateway.
This information is necessary for the nanoBTS to be able to communicate with the
other functions of BTS Installer and with the BSC.
Details of how to design an IP network for nanoBTSs are outside the scope of this
User Guide.
6.6.2 Prerequisites for the DHCP server to work
The DHCP server will not offer IP addresses except where it is absolutely certain that
you want it to do so – it is very careful to avoid disrupting the operation of other DHCP
servers that may be on the local area network. At any stage, if BTS Installer’s built-in
DHCP server is at all unsure that it should be offering an IP address to a particular
device, it will not offer any address.
Hint: If BTS Installer’s DHCP server is not giving a BTS an IP address when you think
it should be, first look in the BTS Database pane and check the indicator in the DHCP
column for the BTS in question. If the indicator is grey (rather than yellow, red, or
green), BTS Installer will not try to give out an IP address, because you haven’t ticked
the Enable DHCP Configuration check box on the DHCP tab of the BTS Configuration
dialog box: click the Edit button to bring up the dialog box and then correct the
problem.
In addition there are a number of network configuration issues that can stop the DHCP
server from working. A complete discussion of DHCP network design is outside the
scope of this User Guide, but some requirements and pitfalls are mentioned below.
In order for the DHCP server to succeed in allocating an IP address to a nanoBTS all
the following conditions must be met:
• There must be an entry for the nanoBTS in the BTS Database – see section
6.3.1.
•
The MAC address in the BTS Database entry must match the MAC address of
the nanoBTS; normally this is as printed on the bar code label attached to the
nanoBTS. (Alternatively, if BTS Installer is in Unknown BTS Mode – see
section 6.3.3.2 – then a request from any nanoBTS will be accepted regardless
of MAC add
resses matching.)
• The nanoBTS must have its various flags correctly configured to use DHCP to
acquire an IP address, see section 6.7.9.
•
The DHCP configuration phase for this nanoBTS must be enabled – see the
Hint above (and more details in
sections 6.3.2 and 6.4.6)