G'day all,
I am using bind as a caching name server and have found that it seems to
be very slow when doing reverse DNS lookups. In particular, it seems to be
only caching them for about 5 minutes, and is very slow (up to 2 minutes)
when it is not in the cache. It first showed up when using "who" with
people telnet connected. "Who" likes to show the hostname telneted from.
Another thing interesting is the hostnames that are being looked up are in
my /etc/hosts file, but still take ages. An strace of who shows that "who"
is doing something with the hosts file, and then trying "named" and timing
out and retrying a few times before it completes. There is nothing
reported in my logs.
I have a default configuration for a caching only bind configuration. here
are my configuration files (sorry for the size of this post).
ABO
-----------------------/etc/host.conf-----------------------
order hosts,bind
multi on
-----------------------/etc/resolve.conf--------------------
search apana.org.au
nameserver 127.0.0.1
----------------------/etc/hosts----------------------------
127.0.0.1 localhost
#
203.12.237.9 minkirri.apana.org.au minkirri
203.12.237.10 slamdunk.apana.org.au slamdunk
203.12.237.11 warlu.apana.org.au warlu
203.12.237.12 pirli.apana.org.au pirli
# 203.12.237.13 ngapa.apana.org.au ngapa
# 203.12.237.14 walya.apana.org.au walya
#
203.12.237.33 dialup-1.minkirri.apana.org.au dialup-1
203.12.237.34 dialup-2.minkirri.apana.org.au dialup-2
203.12.237.35 dialup-3.minkirri.apana.org.au dialup-3
203.12.237.36 dialup-4.minkirri.apana.org.au dialup-4
#
203.12.236.11 ocelot.apana.org.au ocelot
203.12.236.10 core.apana.org.au core
203.12.236.14 hock.apana.org.au hock news
192.189.54.17 ntp.connect.com.au ntp
#
# Broadcast address 203.12.237.15
# Subnet address 203.12.237.8
#
# End of hosts.
---------/etc/named.boot->/var/named/named.boot------------
;
; Boot file for name server
;
directory /var/named
; type domain source file
cache . named.root
; Zone boot information and daemon options are kept in other files
include boot.zones
include boot.options
--------------------/var/named/boot.zones-------------------
;
; Name server zone boot file
; See named(8) for syntax and further information
;
; type domain source file
------------------/var/named/boot.options-----------------
;
; Options for name server
; Use `bindconfig' to automatically configure this file
;
forwarders 192.188.107.12 203.8.183.1
options forward-only
; type domain source file
primary localhost named.local
primary 127.in-addr.arpa named.rev-local
;; Custom configurations below (will be preserved)
------------------/var/named/named.local----------------------
;
; BIND data file for local loopback interface
;
@ IN SOA localhost. root.localhost. (
1 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Default TTL
;
@ IN NS localhost.
@ IN A 127.0.0.1
------------------/var/named/named.rev-local-----------------------
;
; BIND reverse data file for local loopback interface
;
@ IN SOA localhost. root.localhost. (
1 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Default TTL
;
@ IN NS localhost.
1.0.0 IN PTR localhost.
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