This file is indexed.

/usr/share/doc/dibbler-server/examples/server-extraopts.conf is in dibbler-server 0.7.3-1.3.

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The actual contents of the file can be viewed below.

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#
# Example server configuration file
#
# This config. file is considered all-purpose as it instructs server
# to provide almost every configuratio
# 

# Logging level range: 1(Emergency)-8(Debug)
log-level 8

# Don't log full date
log-mode short

# set preference of this server to 0 (higher = more prefered)
preference 0

# adding extra option is experimental. This allows non-standard/extra behavior
experimental

iface "eth0" {

# assign addresses from this pool
 class {
   pool 2000::/64
 }

# send those extra options to the client
 option extra 1234-0x012345679abcdef,7777-0x01,8888-0x8888
}