Some error messages are (unfortunately by design). The ones down here are known and not likely to be fixed. 

= /var/run/dmesg.boot aka bootlog =
== syslogd ==
{{{
Aug  4 10:57:19  syslogd: hostname nor servname provided, or not known: Invalid argument
}}}
Cause: Sylog configured to log remotely, see:
{{{
ChangeMe# grep '@' /etc/syslog.conf
*.*						@loghost.wleiden.net
}}}
But remote host {{{loghost.wleiden.net}}} is not found in DNS.
Possible fix: Creation and maintenance of {{{/etc/hosts}}} file for critical startup services
== ntpdate ==
{{{
Setting date via ntp.
Error : hostname nor servname provided, or not known
 4 Aug 10:57:22 ntpdate[1031]: can't find host proxy1.wleiden.net
Error : hostname nor servname provided, or not known
 4 Aug 10:57:22 ntpdate[1031]: can't find host proxy2.wleiden.net
Error : hostname nor servname provided, or not known
 4 Aug 10:57:22 ntpdate[1031]: can't find host proxy3.wleiden.net
Error : hostname nor servname provided, or not known
 4 Aug 10:57:22 ntpdate[1031]: can't find host 0.nl.pool.ntp.org
 4 Aug 10:57:22 ntpdate[1031]: no servers can be used, exiting
}}}
Cause: ntpdate configured to to use remote ip which cannot be reached, resolved on initial sync as routing is not active yet:
{{{
# grep server /etc/ntp.conf | grep -e wleiden -e pool
server proxy1.wleiden.net #	autokey
server proxy2.wleiden.net #	autokey
server proxy3.wleiden.net #	autokey
server 0.nl.pool.ntp.org  # 	In case machine get hooked to internet (and got working dns)
}}}
Possible fix: Creation and maintenance of {{{/etc/hosts}}} file for critical startup services

== dhcpd ==
{{{
Aug  4 10:57:24 ChangeMe dhcpd: Not configured to listen on any interfaces!
Not configured to listen on any interfaces!
}}}
Cause: dhcpd has not been assigned any interfaces, to use. Merely found during boot

== ath ==
{{{
/etc/rc.d/sysctl: WARNING: sysctl dev.ath.0.acktimeout does not exist.
/etc/rc.d/sysctl: WARNING: sysctl dev.ath.1.acktimeout does not exist.
/etc/rc.d/sysctl: WARNING: sysctl dev.ath.2.acktimeout does not exist.
}}}
Cause: Fixed setting of sysctl (distance timeout hack/tweak) of ath cards which might not exist in the system.
{{{
# grep ath /etc/sysctl.conf
dev.ath.0.acktimeout=35
dev.ath.1.acktimeout=35
dev.ath.2.acktimeout=35
}}}
Possible fix: write wrapper script to actively check for existence before enabling or hack ath driver to make a always existing default sysctl option available

== ntpd ==
{{{
Aug  4 10:57:36 ChangeMe ntpd_initres[1320]: host name not found: proxy1.wleiden.net
Aug  4 10:57:36 ChangeMe ntpd_initres[1320]: couldn't resolve `proxy1.wleiden.net', giving up on it
Aug  4 10:57:36 ChangeMe ntpd_initres[1320]: host name not found: proxy2.wleiden.net
Aug  4 10:57:36 ChangeMe ntpd_initres[1320]: couldn't resolve `proxy2.wleiden.net', giving up on it
Aug  4 10:57:36 ChangeMe ntpd_initres[1320]: host name not found: proxy3.wleiden.net
Aug  4 10:57:36 ChangeMe ntpd_initres[1320]: couldn't resolve `proxy3.wleiden.net', giving up on it
Aug  4 10:57:37 ChangeMe ntpd_initres[1320]: host name not found: 0.nl.pool.ntp.org
Aug  4 10:57:37 ChangeMe ntpd_initres[1320]: couldn't resolve `0.nl.pool.ntp.org', giving up on it
}}}
See: ntpdate