Installation Instructions

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COMPANY CONFIDENTIAL CENG0336_XE_nanoBTS_Installation_and_Test_Manual.doc
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• The DHCP server must have an IP address to offer to the nanoBTS, either
configured explicitly or chosen from a pool, as described below, and the subnet
mask and default gateway for the nanoBTS must be specified.
• The DHCP server must know the IP address of the interface on which it is to
respond to requests – see section 6.5.1.2.
•
The DHCP server must be running – when it is running the Start button will be
disabled and the Stop button will be enabled.
• There must be a network connection between the nanoBTS and BTS Installer
that allows the relevant broadcast UDP messages to be sent and received;
typically this will be the case if they are both on the same local area network, or
if all routers between them are running an appropriately configured BOOTP
Relay Agent.
• There must be no software, for example a personal firewall, running on the
machine with BTS Installer that blocks packets incoming to UDP port 67 (which
the firewall might list as "DHCP server" or "BOOTP server") or packets
outgoing from UDP port 68 (which the firewall might list as "DHCP client" or
"BOOTP client").
Also under no circumstances will BTS Installer’s built-in DHCP server offer an IP
address to any device that doesn’t appear to be a nanoBTS. This is achieved by
checking that the device quotes a Vendor Class Identifier that matches a known string,
all of which currently start with “com.ipaccess.nanobts”.
6.6.3 Assigning an IP address to a nanoBTS
There are two ways in which you can tell the DHCP server which IP address to
allocate to a nanoBTS:
• If there is an explicit IP address specified on the “BTS” tab of the “BTS
Configuration” dialog box box then the DHCP server will offer this IP address to
the nanoBTS. Choose this option if it matters to you exactly which nanoBTS
gets which IP address.
• Otherwise, if there are any unused addresses in its IP Address Pool, the DHCP
server will choose one of these to offer to the nanoBTS. Choose this option if
you don’t mind which nanoBTS gets which IP address, within a particular set of
addresses.
The IP Address Pool is a set of IP addresses which you specify as being available to
the DHCP server for it to offer to nanoBTSs. (If you allocate an explicit IP address to
all nanoBTS then the pool is not used and can be empty.)
There are two ways to get IP addresses into the IP Address Pool:
• From the configuration file.
• By editing the pool using the Pool button.
See section 6.5.2.2 for details on how to edit the IP address pool.
In the IP address pool d
isplay, a red colour, showing that a nanoBTS has rejected this
IP address, might indicate a network configuration problem. The most likely reason for
a nanoBTS to reject an IP address is that it has discovered that some other device on
the network is already using this address; trying to use the same address twice
suggests a network configuration error.