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Old 01-23-2010, 04:26 PM   #1
ciuly
LQ Newbie
 
Registered: Jun 2009
Location: Romania
Distribution: CentOS CLI-only kernel 2.6.18-194.32.1.el5
Posts: 24

Rep: Reputation: 2
dns is "weird" on centos 5.4

I installed centos 5.4 on a new pc in order to upgrade my server.
I set up networking as I usually did on RH 9 (the server is text mode only).
the setup is something like this:
- current server is gateway for internal network (windows desktops)
- new server (the one I'm talking about here) is at the moment just another machine in the internal network
- I can ping the gateway, any stations on the internal network and any external ip. but not an external host. It won't resolv.
- I disabled selinux. still nothing.
- I do cat /etc/resolv.conf and I have 2 nameserver entries there
- I then do dig @IP1 A google.com and it lists everything correctly; (IP1 is the first nameserver entry from resolv.conf) which is as expected since I am able to ping external IPs, but I did the check to see if the dns server was maybe dead or something. so it's not.

here's the stuff as is (ip addresses are a.b.c.d-ed where appropriate. 10.42.103.x is the internal network. 10.42.103.115 is the new server and 10.42.103.110 is the old server (actual gateway)):

Code:
[root@Impuls ~]# cat /etc/resolv.conf
nameserver a.b.c.d
nameserver a.b.c.e
[root@Impuls ~]# cat /etc/host.conf
order hosts,bind
[root@Impuls ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost localhost.localdomain localhost
[root@Impuls ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.42.103.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         10.42.103.110   0.0.0.0         UG    0      0        0 eth0
[root@Impuls ~]# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
IPV6INIT=no
HOSTNAME=Impuls
GATEWAY=10.42.103.110
[root@Impuls ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:B0:D0:AA:FA:E3
          inet addr:10.42.103.115  Bcast:10.42.103.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:672 errors:0 dropped:0 overruns:0 frame:0
          TX packets:757 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:66600 (65.0 KiB)  TX bytes:72241 (70.5 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)
[root@Impuls ~]# chkconfig --list
NetworkManager  0:off   1:off   2:off   3:off   4:off   5:off   6:off
acpid           0:off   1:off   2:on    3:on    4:on    5:on    6:off
amd             0:off   1:off   2:off   3:off   4:off   5:off   6:off
anacron         0:off   1:off   2:on    3:on    4:on    5:on    6:off
apmd            0:off   1:off   2:on    3:on    4:on    5:on    6:off
arptables_jf    0:off   1:off   2:on    3:on    4:on    5:on    6:off
arpwatch        0:off   1:off   2:off   3:off   4:off   5:off   6:off
atd             0:off   1:off   2:off   3:on    4:on    5:on    6:off
auditd          0:off   1:off   2:on    3:on    4:on    5:on    6:off
autofs          0:off   1:off   2:off   3:on    4:on    5:on    6:off
avahi-daemon    0:off   1:off   2:off   3:off   4:off   5:off   6:off
avahi-dnsconfd  0:off   1:off   2:off   3:off   4:off   5:off   6:off
conman          0:off   1:off   2:off   3:off   4:off   5:off   6:off
cpuspeed        0:off   1:on    2:on    3:on    4:on    5:on    6:off
crond           0:off   1:off   2:on    3:on    4:on    5:on    6:off
cups            0:off   1:off   2:off   3:off   4:off   5:off   6:off
dc_client       0:off   1:off   2:off   3:off   4:off   5:off   6:off
dc_server       0:off   1:off   2:off   3:off   4:off   5:off   6:off
dhcpd           0:off   1:off   2:off   3:on    4:off   5:off   6:off
dhcrelay        0:off   1:off   2:off   3:off   4:off   5:off   6:off
dnsmasq         0:off   1:off   2:off   3:off   4:off   5:off   6:off
firstboot       0:off   1:off   2:off   3:on    4:off   5:on    6:off
gpm             0:off   1:off   2:on    3:on    4:on    5:on    6:off
haldaemon       0:off   1:off   2:off   3:on    4:on    5:on    6:off
ibmasm          0:off   1:off   2:off   3:off   4:off   5:off   6:off
ip6tables       0:off   1:off   2:off   3:off   4:off   5:off   6:off
ipmi            0:off   1:off   2:off   3:off   4:off   5:off   6:off
ipsec           0:off   1:off   2:off   3:off   4:off   5:off   6:off
iptables        0:off   1:off   2:on    3:on    4:on    5:on    6:off
irqbalance      0:off   1:off   2:on    3:on    4:on    5:on    6:off
kdump           0:off   1:off   2:off   3:off   4:off   5:off   6:off
kudzu           0:off   1:off   2:off   3:on    4:on    5:on    6:off
lvm2-monitor    0:off   1:on    2:on    3:on    4:on    5:on    6:off
mcstrans        0:off   1:off   2:on    3:on    4:on    5:on    6:off
mdmonitor       0:off   1:off   2:on    3:on    4:on    5:on    6:off
mdmpd           0:off   1:off   2:off   3:off   4:off   5:off   6:off
messagebus      0:off   1:off   2:off   3:on    4:on    5:on    6:off
microcode_ctl   0:off   1:off   2:on    3:on    4:on    5:on    6:off
multipathd      0:off   1:off   2:off   3:off   4:off   5:off   6:off
netconsole      0:off   1:off   2:off   3:off   4:off   5:off   6:off
netfs           0:off   1:off   2:off   3:on    4:on    5:on    6:off
netplugd        0:off   1:off   2:off   3:off   4:off   5:off   6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off
nfs             0:off   1:off   2:off   3:off   4:off   5:off   6:off
nfslock         0:off   1:off   2:off   3:on    4:on    5:on    6:off
nscd            0:off   1:off   2:off   3:off   4:off   5:off   6:off
ntpd            0:off   1:off   2:off   3:off   4:off   5:off   6:off
oddjobd         0:off   1:off   2:off   3:off   4:off   5:off   6:off
pcscd           0:off   1:off   2:on    3:on    4:on    5:on    6:off
portmap         0:off   1:off   2:off   3:on    4:on    5:on    6:off
psacct          0:off   1:off   2:off   3:off   4:off   5:off   6:off
rawdevices      0:off   1:off   2:off   3:on    4:on    5:on    6:off
rdisc           0:off   1:off   2:off   3:off   4:off   5:off   6:off
readahead_early 0:off   1:off   2:on    3:on    4:on    5:on    6:off
readahead_later 0:off   1:off   2:off   3:off   4:off   5:on    6:off
restorecond     0:off   1:off   2:on    3:on    4:on    5:on    6:off
rpcgssd         0:off   1:off   2:off   3:on    4:on    5:on    6:off
rpcidmapd       0:off   1:off   2:off   3:on    4:on    5:on    6:off
rpcsvcgssd      0:off   1:off   2:off   3:off   4:off   5:off   6:off
saslauthd       0:off   1:off   2:off   3:off   4:off   5:off   6:off
sendmail        0:off   1:off   2:on    3:on    4:on    5:on    6:off
setroubleshoot  0:off   1:off   2:off   3:on    4:on    5:on    6:off
smartd          0:off   1:off   2:on    3:on    4:on    5:on    6:off
smb             0:off   1:off   2:off   3:off   4:off   5:off   6:off
squid           0:off   1:off   2:off   3:off   4:off   5:off   6:off
sshd            0:off   1:off   2:on    3:on    4:on    5:on    6:off
syslog          0:off   1:off   2:on    3:on    4:on    5:on    6:off
tcsd            0:off   1:off   2:off   3:off   4:off   5:off   6:off
tux             0:off   1:off   2:off   3:off   4:off   5:off   6:off
vsftpd          0:off   1:off   2:off   3:on    4:off   5:off   6:off
winbind         0:off   1:off   2:off   3:off   4:off   5:off   6:off
wpa_supplicant  0:off   1:off   2:off   3:off   4:off   5:off   6:off
xfs             0:off   1:off   2:on    3:on    4:on    5:on    6:off
xinetd          0:off   1:off   2:off   3:on    4:on    5:on    6:off
ypbind          0:off   1:off   2:off   3:off   4:off   5:off   6:off
yum-updatesd    0:off   1:off   2:on    3:on    4:on    5:on    6:off

xinetd based services:
        chargen-dgram:  off
        chargen-stream: off
        daytime-dgram:  off
        daytime-stream: off
        discard-dgram:  off
        discard-stream: off
        echo-dgram:     off
        echo-stream:    off
        eklogin:        off
        ekrb5-telnet:   off
        gssftp:         off
        klogin:         off
        krb5-telnet:    off
        kshell:         off
        rexec:          off
        rlogin:         off
        rmcp:           off
        rsh:            off
        rsync:          off
        tcpmux-server:  off
        time-dgram:     off
        time-stream:    off
[root@Impuls ~]#
iptables is empty and "allow" everything. although that shouldn't matter in this case.
ipv6 is disabled.

there are a lot of services in centos that I don't recognize and so I posted them all just in case there is some other one there that may be interfering. also, if you happen to see anything that is normally not needed on a dedicated server (like I found cups and avahi (no wireless arond)) do let me know. I will probably go through the list myself to see what everything is but first I want to set up basic suff.

so what am I missing? beside dns, the networking is working fine. what is messing up my dns?

thanks.
 
Old 01-23-2010, 05:25 PM   #2
nimnull22
Senior Member
 
Registered: Jul 2009
Distribution: OpenSuse 11.1, Fedora 14, Ubuntu 12.04/12.10, FreeBSD 9.0
Posts: 1,571

Rep: Reputation: 92
What inside of nsswitch.conf is?
 
Old 01-24-2010, 03:22 AM   #3
ciuly
LQ Newbie
 
Registered: Jun 2009
Location: Romania
Distribution: CentOS CLI-only kernel 2.6.18-194.32.1.el5
Posts: 24

Original Poster
Rep: Reputation: 2
Code:
[root@Impuls ~]# cat /etc/nsswitch.conf
#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Legal entries are:
#
#       nisplus or nis+         Use NIS+ (NIS version 3)
#       nis or yp               Use NIS (NIS version 2), also called YP
#       dns                     Use DNS (Domain Name Service)
#       files                   Use the local files
#       db                      Use the local database (.db) files
#       compat                  Use NIS on compat mode
#       hesiod                  Use Hesiod for user lookups
#       [NOTFOUND=return]       Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     files
shadow:     files
group:      files

#hosts:     db files nisplus nis dns
hosts:      files dns

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files

bootparams: nisplus [NOTFOUND=return] files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files

netgroup:   nisplus

publickey:  nisplus

automount:  files nisplus
aliases:    files nisplus

[root@Impuls ~]#
 
Old 01-24-2010, 03:38 AM   #4
ciuly
LQ Newbie
 
Registered: Jun 2009
Location: Romania
Distribution: CentOS CLI-only kernel 2.6.18-194.32.1.el5
Posts: 24

Original Poster
Rep: Reputation: 2
since I'm not using NIS (at least I don't want to) I have changed the nssswithc.conf file to look like this (basically removed any nis stuff and changed the order in hosts. still not working.
Code:
[root@Impuls ~]# cat /etc/nsswitch.conf
#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Legal entries are:
#
#       nisplus or nis+         Use NIS+ (NIS version 3)
#       nis or yp               Use NIS (NIS version 2), also called YP
#       dns                     Use DNS (Domain Name Service)
#       files                   Use the local files
#       db                      Use the local database (.db) files
#       compat                  Use NIS on compat mode
#       hesiod                  Use Hesiod for user lookups
#       [NOTFOUND=return]       Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     files
shadow:     files
group:      files

#hosts:     db files nisplus nis dns
#hosts:      files dns
hosts:      dns files

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files

#bootparams: nisplus [NOTFOUND=return] files
bootparams: files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files

#netgroup:   nisplus

#publickey:  nisplus

#automount:  files nisplus
#aliases:    files nisplus
automount:  files
aliases:    files

[root@Impuls ~]#
 
Old 01-24-2010, 03:58 AM   #5
ciuly
LQ Newbie
 
Registered: Jun 2009
Location: Romania
Distribution: CentOS CLI-only kernel 2.6.18-194.32.1.el5
Posts: 24

Original Poster
Rep: Reputation: 2
I'm not sure if it's related or not, but when I log in with putty, after user/pass it takes a a few minutes until I get the shell prompt. Also, when I start mc (midnight commander) it takes a few minutes until it actually starts.
I've added the gateway (old server), the win machine from where I conenct to and the local intranet ip for the problematic centos to it's hosts file but still nothing.
 
Old 01-24-2010, 08:13 AM   #6
ciuly
LQ Newbie
 
Registered: Jun 2009
Location: Romania
Distribution: CentOS CLI-only kernel 2.6.18-194.32.1.el5
Posts: 24

Original Poster
Rep: Reputation: 2
found the problem: stupid typo. the dns servers had 144 as one of the ip component. I typed 114.
I found this after, instead of typing, I cat /etc/resolv.conf and the copy pasted the ip into dig @
and that's how I wasted a day's work on this. bah.
 
  


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