
Performing the Initial Setup
DHCP Client 2-5
There is no DHCP enable/disable flag in Config mode. DHCP is
sensed on or off based on whether ppciboot learns its IP via
DHCP. If DHCP is enabled in ppciboot, but fails to get its IP via
DHCP, and instead gets an IP via RARP, then after the LX loads,
DHCP will not be enabled.
The DHCP Client feature allows an Ethernet interface to query
the DHCP server for configuration options. This was done
primarily to support DHCP leasing. The following configuration
options are supported:
DNS servers
default route
DHCP lease
IP address
IP address mask
IP broadcast address
The DNS servers, default route, and DHCP lease time
configuration settings are optional and can’t be specified by the
DHCP client. If the configuration sent by the DHCP server
conflicts with the configuration specified in the shared memory,
the settings sent by the server take precedence.
The LX and ppciboot software has been enhanced to include a
“boot_release” application which releases the DHCP lease
obtained during boot time, if necessary. The “boot_release”
application uses the udhcpc client to handle the actual DHCP
requests.
L DHCP is enabled on the LX only at runtime, if the LX
used DHCP to get its address during ppciboot.
The following information is returned from a DHCP ACK message
(these are not "options", but the information is useful):
Our own IP address
TFTP server IP address
Server (last protocol used) Ethernet address (saves future
ARPs)
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