Chapter 7: Using Bootp / Dhcp; Bootp/Dhcp Server Parameters - 3Com V7122 User Manual

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HAPTER
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
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, subnet mask
a BootP/DHCP process occurs.
Default gateway IP address
configured in the BootP/DHCP server.
TFTP server IP address
server from which the firmware (cmp) and ini files are loaded.
DNS server IP address (primary and secondary)
IP addresses of the
only in DHCP and from Boot version 1.92.
Syslog server IP address:
configured. This parameter is available only in DHCP.
SIP server IP address: Two
configured. These parameters are available only in DHCP.
Firmware file name
be loaded to the gateway using TFTP.
V7122 Gateway User Guide
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IP address and subnet mask
: Mandatory parameters that are sent to the gateway every time
: An optional parameter that is sent to the gateway only if
: An optional parameter that contains the address of the TFTP
primary and secondary
An optional parameter that is sent to the gateway only if
optional parameters that are sent to the gateway only if
: An optional parameter that contains the name of the firmware file to
P / DHCP
OOT
are mandatory:
: Optional parameters that contain the
DNS servers. These parameters are available
Figure 88), or
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