3Com V7111 - VCX 4 Channels Analog FXO Media Gateway User Manual page 42

If the DHCPEnable = 1 line is included in the Gateway's INI file and if the BootP server was
not found, the Gateway initiates its standard DHCP procedure to configure the Gateway
network parameters (IP address, subnet mask, and default router address). If DHCP
procedure is used, you need to find the new Gateway IP address allocated by DHCP server.
Usually the System Administrator can provide this information.
If the BootP/DHCP server has not been found, the VCX V7111 Gateway starts working from
its internal flash memory.
Usually the application software already resides in the VCX V7111 flash memory, therefore
there is no need to use the BootP or TFTP procedure. Their download need only be used for
changing the VCX V7111 configuration or for a new software upgrade.
The BootP protocol enables the network administrators to manage the configuration of the
VCX V7111 Gateway from a central configuration server – the BootP/DHCP server.
The following RFCs (IETF Requests for Comment) describe BootP in detail: RFC 951, RFC
1542, and RFC 2132.
The VCX V7111 download the image file using the Trivial File Transfer Protocol (TFTP). The
TFTP protocol is described in RFC 906 and RFC 1350.
Although DHCP and BootP servers are very similar in operation, the DHCP server includes
some differences that might prevent its operation with BootP clients. However, many DHCP
servers, such as Windows NT DHCP server, are backward-compatible with BootP protocol
and can be used for VCX V7111 configuration.
The BootP server is normally used to configure the VCX V7111 initial parameters.
Once this information has been provided, the BootP server is no longer needed.
All parameters are stored in non-volatile memory and used when the BootP server
is not accessible. The BootP server is required again if, for example, the VCX
V7111 IP address is to be changed.
Using BootP procedure, the following parameters are configured:
Boot and INI File Names – Optional; the boot file name can contain one or two file
names. The file ram.cmp is used to download the application image and the file
MP1XX.INI is used for VCX V7111 provisioning. Either one, two, or no file names can
appear in the Boot file name field. To use both file names, use a semi-colon (;) separator
(without blank spaces) between the xxx.cmp and the yyy.ini files (for example,
ram.cmp;SIPgw.ini).
Local IP Address – IP address of your VCX V7111 Gateway.
Gateway IP Address – If a default Gateway/Router is required, complete this field;
otherwise, enter the address 0.0.0.0.
Subnet Mask – Set the subnet mask fields to correspond to your network IP address
settings.
42 3Com VCX V7111 VoIP SIP Gateways User Manual