I have a system with a static IP address of 192.168.1.150. I configured /etc/network/interfaces manually (i.e. without using NetworkManager.) It is a web server hosting three sites. I am having several issues, the root of all of them being DNS resolution (I think). For some reason I cannot understand, the server thinks its IP address resolves to 192.168.1.251.
I've read about dnsmasq possibly causing this issue: I have searched running processes and don't see it running. I shut DHCP off (I thought) and I don't see it under running processes either. I have diligently researched each individual issue, and they all seem to point to a server misconfiguration of some sort--but I am stumped as to what to change. I would appreciate any help you can provide to fix the problem, or short of that, help me learn more so I can troubleshoot it more effectively. I am maddened by the tedium of having to track down an annoying and debilitating problem with a system that was functioning very well just two days ago.
I cannot be sure, but since I changed nothing, but downloaded several security updates from Ubuntu, I am of course suspicious that one of the things I downloaded upset things.
/etc/network/interfaces:
auto lo eth0
iface lo inet loopback
iface eth0 inet static
address 192.168.1.150
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0
gateway 192.168.1.1
dns-nameservers 8.8.8.8 68.87.69.150
/etc/resolv.conf:
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 8.8.8.8
nameserver 68.87.69.150
/etc/hosts:
127.0.0.1 localhost.localdomain localhost
127.0.1.1 nimue
192.168.1.150 babaluis.com
192.168.1.150 coyote.homeip.net
192.168.1.150 hamiltonpdx.com
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
/etc/nsswitch.conf:
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.
passwd: compat
group: compat
shadow: compat
hosts: dns files mdns4_minimal [NOTFOUND=return] mdns4
networks: files
protocols: db files
services: db files
ethers: db files
rpc: db files
netgroup: nis
route -n:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
nmap -sV nimue:
Starting Nmap 5.21 ( http://nmap.org ) at 2012-12-05 22:39 PST
Nmap scan report for nimue (192.168.1.251)
Host is up (0.00075s latency).
Not shown: 998 closed ports
PORT STATE SERVICE VERSION
53/tcp open domain dnsmasq 2.41
80/tcp open http lighttpd 1.4.18
MAC Address: E0:46:9A:24:F2:D4 (Unknown)
Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 19.20 seconds
If there is other information you need in order to help, please ask.
UPDATE
Output of dig +trace nimue:
; <<>> DiG 9.8.1-P1 <<>> +trace nimue
;; global options: +cmd
. 21088 IN NS a.root-servers.net.
. 21088 IN NS b.root-servers.net.
. 21088 IN NS c.root-servers.net.
. 21088 IN NS d.root-servers.net.
. 21088 IN NS e.root-servers.net.
. 21088 IN NS f.root-servers.net.
. 21088 IN NS g.root-servers.net.
. 21088 IN NS h.root-servers.net.
. 21088 IN NS i.root-servers.net.
. 21088 IN NS j.root-servers.net.
. 21088 IN NS k.root-servers.net.
. 21088 IN NS l.root-servers.net.
. 21088 IN NS m.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 29 ms
;; Received 23 bytes from 192.168.1.251#53(192.168.1.251) in 62 ms
The output of netstat -tlpen is:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State User Inode PID/Program name
tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN 0 13295 2823/perl
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 0 14864 2721/apache2
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 0 569634 8196/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 0 9609 957/cupsd
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 0 12833 2656/master
tcp 0 0 0.0.0.0:538 0.0.0.0:* LISTEN 0 12696 2540/gdomap
tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 0 11088 1018/dovecot
tcp 0 0 0.0.0.0:9571 0.0.0.0:* LISTEN 0 12710 2558/inetd
tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 0 11078 1018/dovecot
tcp 0 0 127.0.0.1:10024 0.0.0.0:* LISTEN 123 9127 1216/amavisd (maste
tcp 0 0 127.0.0.1:10025 0.0.0.0:* LISTEN 0 14818 2656/master
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 116 11120 1051/mysqld
tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 0 11076 1018/dovecot
tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 0 11086 1018/dovecot
tcp 0 0 127.0.0.1:783 0.0.0.0:* LISTEN 0 10252 1241/spamd.pid
tcp6 0 0 :::22 :::* LISTEN 0 569636 8196/sshd
tcp6 0 0 ::1:631 :::* LISTEN 0 9608 957/cupsd
tcp6 0 0 :::25 :::* LISTEN 0 12834 2656/master
tcp6 0 0 :::993 :::* LISTEN 0 11089 1018/dovecot
tcp6 0 0 :::995 :::* LISTEN 0 11079 1018/dovecot
tcp6 0 0 :::110 :::* LISTEN 0 11077 1018/dovecot
tcp6 0 0 :::143 :::* LISTEN 0 11087 1018/dovecot
NetworkManager is running (from ps -aux):
root 944 0.0 0.0 163016 5760 ? Ssl Dec05 0:00 NetworkManager
root 957 0.0 0.0 104104 3596 ? Ss Dec05 0:00 /usr/sbin/cupsd -F
root 972 0.0 0.0 19984 936 tty4 Ss+ Dec05 0:00 /sbin/getty -8 38400 tty4
I do not think nscd is running; I don't see it in ps -aux anywhere. There is no socket for /var/run/nscd/socket.
There is not a LOCALDOMAIN env var.
The output of env -i /usr/bin/getent hosts nimue is:
192.168.1.251 nimue
I moved DNS to the beginning of the list in /etc/nsswitch.conf based on reading a post somewhere that said it should precede the other options. It had no effect on the problem.
ANOTHER UPDATE
I shut down Network Manager so that it no longer runs when the system is booted. I also removed the DHCP server. Nonetheless, nmap continues to report that the server's IP address is 192.168.1.251.
dig +trace nimue. Is network-manager still running? And apparently dnsmasq is running (nmap output). Usenetstat -tlpento get the PID of the process listening on TCP Port 53. – Bananguin Dec 6 '12 at 7:23env -i /usr/bin/getent hosts nimuereturn? – Stéphane Chazelas Dec 6 '12 at 8:25