From: john jens (johnjens@gmail.com)
Date: Tue Apr 05 2005 - 15:13:08 EDT
My internal DNS server has mysteriously stopped resolving reverse DNS
requests while I was on vacation (that'll teach me). I've rebuilt the
db files, via a customized hosts_to_network script, several times with
no effective change. Here's the kicker: the DNS server is multi-homed
and reverse lookups for the second subnet work on the secondary
interface. (clear as mud. see examples.)
cheers,
john jens
# nslookup foo
*** Can't find server name for address 10.162.131.21: Non-existent host/domain
*** Default servers are not available
#
# nslookup foo dns3
Server: dns3.lab.priceinteractive.com
Address: 10.162.130.21
Name: foo.lab.priceinteractive.com
Address: 10.162.131.44
#
# nslookup 10.162.131.44
*** Can't find server name for address 10.162.131.21: Non-existent host/domain
*** Default servers are not available
#
# nslookup 10.162.131.44 dns3
Server: dns3.lab.priceinteractive.com
Address: 10.162.130.21
*** dns3.lab.priceinteractive.com can't find 10.162.131.44:
Non-existent host/domain
#
# nslookup bar dns3
Server: dns3.lab.priceinteractive.com
Address: 10.162.130.21
Name: bar.lab.priceinteractive.com
Address: 10.162.130.55
#
# nslookup 10.162.130.55
*** Can't find server name for address 10.162.131.21: Non-existent host/domain
*** Default servers are not available
#
# nslookup 10.162.130.55 dns3
Server: dns3.lab.priceinteractive.com
Address: 10.162.130.21
Name: bar.lab.priceinteractive.com
Address: 10.162.130.10
=== uname ===
SunOS dns1 5.8 Generic_117350-11 sun4u sparc SUNW,Ultra-60
=== /etc/hosts ===
127.0.0.1 localhost
10.162.131.21 dns1 loghost
10.162.130.21 dns3
10.162.131.20 vdns
=== ifconfig ===
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.162.131.21 netmask ffffff00 broadcast 10.162.131.255
ether 8:0:20:c4:e8:84
hme0:1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.162.131.20 netmask ffffff00 broadcast 10.162.131.255
qfe0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
inet 10.162.130.21 netmask ffffff00 broadcast 10.162.130.255
ether 8:0:20:c4:e8:84
=== netstat ===
10.162.131.21.53 *.* 0 0 24576 0 LISTEN
10.162.130.21.53 *.* 0 0 24576 0 LISTEN
=== named.conf ===
options {
directory "/usr/local/domain";
};
logging {
channel my_file {
file "named_msgs.log" versions 3 size 20m;
severity dynamic;
};
category default { my_file; };
};
// Root Name Servers
zone "." { type hint; file "rootservers"; };
// Loopback
zone "0.0.127.IN-ADDR.ARPA" { type master; file "db.127.0.0"; };
// Lab Priceinteractive
zone "lab.priceinteractive.com" { type master; file "db.lab"; };
zone "ohe.lab.priceinteractive.com" { type master; file "db.ohe"; };
zone "dev.ohe.lab.priceinteractive.com" { type master; file "db.ohe.dev"; };
zone "stg.ohe.lab.priceinteractive.com" { type master; file "db.ohe.stg"; };
zone "dev.sp.lab.priceinteractive.com" { type master; file "db.sp.dev"; };
zone "test.sp.lab.priceinteractive.com" { type master; file "db.sp.test"; };
// Reverse lookups for internal (10.x.x.x) networks
zone "128.162.10.IN-ADDR.ARPA" { type master; file "db.10.162.128"; };
zone "130.162.10.IN-ADDR.ARPA" { type master; file "db.10.162.130"; };
zone "131.162.10.IN-ADDR.ARPA" { type master; file "db.10.162.131"; };
=== snoop ===
...
DNS: ----- DNS Header -----
DNS:
DNS: Response ID = 63063
DNS: RA (Recursion Available)
DNS: Response Code: 3 (Name Error)
DNS: Reply to 1 question(s)
DNS: Domain Name: 20.131.162.10.in-addr.arpa.
DNS: Class: 1 (Internet)
DNS: Type: 12 (Domain Name Pointer)
DNS:
DNS: 0 answer(s)
DNS: 1 name server resource(s)
DNS: Domain Name: 10.in-addr.arpa.
DNS: Class: 1 (Internet)
DNS: Type: 6 (Start Of a zone Authority)
DNS: TTL (Time To Live): 9375
DNS: Start Of a zone Authority:
DNS: MNAME (Server name): prisoner.iana.org.
DNS: RNAME (Resposible mailbox): hostmaster.root-servers.org.
DNS: SeriDNS: Refresh: 1800 Retry: 900 Expire: 604800
Minimum: 604800
DNS:
DNS: 0 additional record(s)
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