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V7122 Gateway User Guide
241
C
HAPTER
7:
U
SING
B
OOT
P
/
DHCP
The gateway uses the Bootstrap Protocol (BootP) and the Dynamic Host Configuration
Protocol (DHCP) to obtain its networking parameters and configuration automatically after it
is reset. BootP and DHCP are also used to provide the IP address of a TFTP server on the
network, and files (
cmp
and
ini
) to be loaded into memory.
DHCP is a communication protocol that automatically assigns IP addresses from a central
point. BootP is a protocol that enables a device to discover its own IP address. Both
protocols have been extended to enable the configuration of additional parameters specific
to the gateway.
A BootP/DHCP request is issued after a power reset (see the flow chart in
Figure 88
), or
after a device exception.
BootP is normally used to initially configure the gateway. Thereafter, BootP is no
longer required as all parameters can be stored in the gateway’s non-volatile
memory and used when BootP is inaccessible. BootP can be used again to
change the IP address of the gateway (for example).
BootP/DHCP Server Parameters
BootP/DHCP can be used to provision the following parameters (included in the
BootP/DHCP reply). Note that only the
IP address and subnet mask
are mandatory:
IP address, subnet mask
: Mandatory parameters that are sent to the gateway every time
a BootP/DHCP process occurs.
Default gateway IP address
: An optional parameter that is sent to the gateway only if
configured in the BootP/DHCP server.
TFTP server IP address
: An optional parameter that contains the address of the TFTP
server from which the firmware (
cmp
) and
ini
files are loaded.
DNS server IP address (primary and secondary)
: Optional parameters that contain the
IP addresses of the
primary and secondary
DNS servers. These parameters are available
only in DHCP and from Boot version 1.92.
Syslog server IP address:
An optional parameter that is sent to the gateway only if
configured. This parameter is available only in DHCP.
SIP server IP address:
Two
optional parameters that are sent to the gateway only if
configured. These parameters are available only in DHCP.
Firmware file name
: An optional parameter that contains the name of the firmware file to
be loaded to the gateway using TFTP.
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