User manual

Etherboot User Manual
-DNO_DHCP_SUPPORT
Use BOOTP instead of DHCP.
-DRARP_NOT_BOOTP
Use RARP instead of BOOTP/DHCP.
-DREQUIRE_VCI_ETHERBOOT
Require an encapsulated Vendor Class Identifier
of "Etherboot" in the DHCP reply
Requires DHCP support.
-DALLOW_ONLY_ENCAPSULATED
Ignore Etherboot-specific options that are not within
the Etherboot encapsulated options field. This option
should be enabled unless you have a legacy DHCP server
configuration from the bad old days before the use of
encapsulated Etherboot options.
-DDEFAULT_BOOTFILE="default_bootfile_name"
Define a default bootfile for the case where your DHCP
server does not provide the information. Example:
-DDEFAULT_BOOTFILE="tftp:///tftpboot/kernel"
If you do not specify this option, then DHCP offers that
do not specify bootfiles will be ignored.
NIC tuning parameters:
-DALLMULTI
Turns on multicast reception in the NICs.
Boot tuning parameters:
-DCONGESTED
Turns on packet retransmission. Use it on a
congested network, where the normal operation
can’t boot the image.
-DBACKOFF_LIMIT
Sets the maximum RFC951 backoff exponent to n.
Do not set this unreasonably low, because on networks
with many machines they can saturate the link
(the delay corresponding to the exponent is a random
time in the range 0..3.5*2^n seconds). Use 5 for a
VERY small network (max. 2 minutes delay), 7 for a
medium sized network (max. 7.5 minutes delay) or 10
for a really huge network with many clients, frequent
congestions (max. 1 hour delay). On average the
delay time will be half the maximum value. If in
doubt about the consequences, use a larger value.
Also keep in mind that the number of retransmissions
is not changed by this setting, so the default of 20
may no longer be appropriate. You might need to set
MAX_ARP_RETRIES, MAX_BOOTP_RETRIES, MAX_TFTP_RETRIES
and MAX_RPC_RETRIES to a larger value.
-DTIMEOUT=n
Use with care!! See above.
Sets the base of RFC2131 sleep interval to n.
This can be used with -DBACKOFF_LIMIT=0 to get a small
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