Installing and Administering Internet Services

Chapter 5 231
Configuring TFTP and BOOTP Servers
Adding Client or Relay Information
where the client resides.
• Gateway address—the address of the gateway that connects the
client’s local subnet to the BOOTP server’s subnet.
• Boot server(s) for client—the boot servers to which the local system
will relay the client’s bootrequest.
• Threshold value—the number of seconds since the client sent its first
request.
• Maximum hops—the maximum number of hops that the client’s
bootrequest can be forwarded.
Understanding Boot File Configurations
A configuration entry is a single line with the following format:
hostname : tag = value : tag = value :... tag = value
Each client parameter is defined with a two-character case-sensitive tag
followed by the equals sign (=) and the tag’s client-specific value. A colon
separates each tag = value parameter definition. bootpd uses these tags
and values to recognize a client’s bootrequest, supply parameters in the
bootreply to the client, or relay the bootrequest.
For example, parameters for the BOOTP client xterm01 are represented
with the following entry in /etc/bootptab:
xterm01: ht=ether: ha=080009030166: ip=15.19.8.2:\
sm=255.255.248.0: gw=15.19.8.1: bf=/xterm01
This entry tells bootpd the following information about xterm01:
• Hardware type is an Ethernet network interface.
• Hardware address is 080009030166.
• IP address is 15.19.8.2.
• Subnet mask is 255.255.248.0.
• The address of the gateway is 15.19.8.1.
• The file /xterm01 should be retrieved with TFTP.
You may enter tags in any order, with the following exceptions:
• The client’s hostname must be the first field of an entry.
• The ht (hardware type) tag, if specified, must precede the ha