Networking :: How To Make Nslookup Return Failure If DNS Server Fails
Mar 23, 2011
I'm trying to find a command to tell nslookup, "I want you to try to resolve hostname X using DNS server Y, and if the lookup fails, just output failure do NOT fail over to some other DNS server as a backup and use it to try to resolve the same hostname."I'm trying to follow the man page instructions for doing this, but it doesn't seem to work. The man page for nslookup on my system (CentOS 5.5) includes the line:
"[no]fail Try the next nameserver if a nameserver responds with SERVFAIL or a referral (nofail) or terminate query (fail) on such a response."But if I try using that option, the output seems to indicate that after the lookup failed on ns1.afraid.org, nslookup failed over to 208.67.220.220 (the first nameserver listed in my resolv.conf -- an OpenDNS nameserver) and used it to resolve the hostname instead.
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Jan 18, 2011
I am inquiring about an error i have run into when i tried to make the driver "Ralink 2750 usb enhanced drvier". I downloaded it from this site [URL]... My wifi card according to lsusb is a 2570 Ralink Technology, Corp. 802.11g WiFi. I extract the package inside my /home/user/Downloads directory, using tar -xvf /home/user/Downloads/rt2570-k2wrlz-1.6.4.tar.bz2 That works fine and extracts the file, but once i change the working directory to /home/user/Downloads/rt2570-k2wrlz-1.6.4/Module and run the 'make' command, i receive the following error.
[code]...
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Feb 8, 2009
For what purpose does "nslookup" command should be used? Any examples.
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Oct 20, 2009
Don't work nslookup from clients guest OS.I have LinuxMint 7 and I'm installed VirtualBox on her. I created three guests OS. Two CentOS and XP
Name
The first CentOS linux1.starline.ca
The second CentOS centos.starline.ca
The third XP xp2.starline.ca[code].....
On the clients guest OS nslookup don't work. It write : timed out; no servers could be reached .What is going on? Why nslookup don't work from clients guest OS?On client machine in the file /etc/resolv.conf have record ameserver 168.135.88.2
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Aug 13, 2010
This is a problem which has been plaguing me ever since the upgrade from Karmic to Lucid.
I used to be able to log into any one of the seven TTYs.
CTRL-ALT F1-six all work fine. Problem is if I log into one I can't get back to the GUI.
Immediately after the upgrade, I was told by some people that this was deprecated along with startx and I should use sudo gdm service start instead.
This doesn't work for me If I have to open a terminal when a nasty game freezes and I have to kill it from a terminal.
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May 5, 2010
When i enter ip or address nslookup does not reply any answer. It shows no server found. "servfail". This is my named.conf file:
[Code]....
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Nov 10, 2010
Not really a linux specific thing I have gooled the heck out of it and tried nslookup -a and a few other options nothing gets me what I need. The question is I have a machine with several aliases in dns. How do I do a nslookup and display all the aliases for a system.
I am trying to see if something it aliased correctly but i cannot list all the names a system is know by.
I am sure its something simple I am missing with a switch.
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Feb 4, 2011
I am not so experienced with networking in Linux. I've successfully installed Red Hat Linux Enterprise 5.2 on a VMware host. When I issued nslookup command, it returns "connection timed out" error as follows:
Code:
[root@rac1 ~]# time nslookup rac1
;; connection timed out; no servers could be reached
real 0m15.038s
user 0m0.000s
sys 0m0.000s
My questions are:
(1) Is that error normal?
(2) Is there a way to decrease the 15.038s value? rac1 is the local hostname, so why it takes all that time to resolve it.
Following info may help:
Code:
[root@rac1 ~]# hostname
rac1.mydomain.com
[root@rac1 ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
#eth0 - PUBLIC
192.0.2.100 rac1.mydomain.com rac1
[root@rac1 ~]# ping -c 4 rac1
PING rac1.mydomain.com (192.0.2.100) 56(84) bytes of data.
64 bytes from rac1.mydomain.com (192.0.2.100): icmp_seq=1 ttl=64 time=0.015 ms
64 bytes from rac1.mydomain.com (192.0.2.100): icmp_seq=2 ttl=64 time=0.029 ms
64 bytes from rac1.mydomain.com (192.0.2.100): icmp_seq=3 ttl=64 time=0.029 ms
64 bytes from rac1.mydomain.com (192.0.2.100): icmp_seq=4 ttl=64 time=0.029 ms
--- rac1.mydomain.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3000ms
rtt min/avg/max/mdev = 0.015/0.025/0.029/0.007 ms
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Nov 29, 2010
I'm finding that I can not resolve .local domains anywhere except with nslookup and found on the LucidLynx release notes that there is a problem with avahi causing this. Although the avahi service is convenient for locating printers and such can anyone else tell me what other services/options will be impacted on a default installation of Ubuntu if I disable this service?
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Jun 11, 2010
Recently I installed RedHat Enterprise 5 on a windows machine. The machine is configured to use DHCP, but I have been seeing some strange behavior if I do nslookup on the machine's IP:
[someuser@lin01 mydir]$ nslookup 10.5.x.x
Server: 10.10.x.xx
Address: 10.10.x.xx#53
x.x.5.10.in-addr.arpa name = xyz.something.
x.x.5.10.in-addr.arpa name = lenovo-d1690047.
x.x.5.10.in-addr.arpa name = pqdlds.
x.x.5.10.in-addr.arpa name = lin01.mydomain.com.
Where only the last entry of [URL] is actually correct, how can remove the other entries? I spoke to my IT Manager and he cannot see these stale entries in the DNS (we are using windows AD)
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Apr 11, 2011
I'm running a server and Cogeco doesn't want that.
What I want to do is make it so when someone goes to my_domain/ apache will pretend it doesn't exist, but I want subdirectories to work still.
What I tried was denying access to /var/www, but the apache returns with a message for that.
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Sep 10, 2010
I'm attempting to get 10.04 to connect to an SBS 2003 pptp vpn server, but for the life of me have been unable to find or implement a working solution. System previously had 8.x and 9.x and had no difficulty connecting to same server, but on a fresh install of 10.04 cannot connect.
tail -f /var/log/syslog shows the following:
Code:
Sep 10 15:19:32 ubuntu NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...
Sep 10 15:19:32 ubuntu NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started
[Code]....
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Sep 1, 2011
Ubuntu has been reporting a System error problem but when it try's send a report to your servers, it fails due to it's failure of identifying the packet id, i honestly have no idea of how to go about fixing this problem or even identifying the packet that's broken, please do help, as now my Apache server's not working properly, and a couple of other programs are getting affected by this, event installing and updating s an issue.
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Jun 27, 2011
I have a set of bash scripts that I'm running that automatically build a set of packages for me and redirect their output into logs. Basically, I have a bunch of lines that are something like this: ${CONFIGURE_DIR}/configure &> ${LOG_DIR}/log or cd ${CONFIGURE_DIR} && make &> ${LOG_DIR}/log, etc.
This is supposed to make the entire process silent. However, sometimes with some packages some output leaks to my console (either stdout or stderr). I'm thinking that maybe the configure scripts/make are executing commands within new shell instances that don't inherit my redirect, or something to that effect.
Another reason for thinking this is that in another part of my script I detect errors when running make by testing with "if [ $? -ne 0 ]", and if the redirect leaks to my console and also the leaked output indicates that the build failed ("make: Error" and so on), then my $? test fails (i.e., it thinks that $? == 0, whereas a failed make should return a non-zero value). It's as if my original script can't "see" the results from child commands executed from later scripts.
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Mar 16, 2011
I am trying to make a slackbuild for the bigforth package (source:[URL]However when I run make I get the following error messages:
Code:
bash-4.1# make
env LIBDIR=/usr/local/lib/bigforth SRC=/usr/local/lib/bigforth/src ./forthker -e " include startup.fb ' .blk
[code]....
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Jan 6, 2011
I have been trying to connect to my University's VPN Server and for some reason vpnc fails. I have configured the vpn settings the same way I did for the past two years. They worked properly on Fedora 12 and 13, but for some reason fails on Fedora 14.
Code:
Jan 6 16:45:20 exodusprime NetworkManager[1269]: <info> Starting VPN service 'vpnc'...
Jan 6 16:45:20 exodusprime NetworkManager[1269]: <info> VPN service 'vpnc' started (org.freedesktop.NetworkManager.vpnc), PID 11731
Jan 6 16:45:20 exodusprime NetworkManager[1269]: <info> VPN service 'vpnc' appeared; activating connections
Jan 6 16:45:21 exodusprime NetworkManager[1269]: <info> VPN plugin state changed: 3
Jan 6 16:45:21 exodusprime NetworkManager[1269]: <info> VPN connection 'Swinburne University VPN' (Connect) reply received.
code....
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Jan 10, 2010
I'm trying to configure a DHCP server but when I try to start it it just fails.
Code:
log
Jan 10 16:25:52 SRV-LINUX00 dhcpd: Copyright 2004-2008 Internet Systems Consortium.
[code]....
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Jun 3, 2010
Ubuntu Jaunty Server connected via eth0 to a Billion residential ADSL router. I've locked the server MAC address to a specific IP in the router and set the DHCP renewal times to the longest possible times. For a certain number of days, the server will remain connected to the router, but then for some reason (the last time it was after about a month), the server loses it's connect and dumps into syslog the following:
Code:
Jun 2 17:10:15 defiant dhclient: DHCPREQUEST of 192.168.1.105 on eth0 to 192.168.1.254 port 67
Jun 2 17:11:26 defiant dhclient: last message repeated 5 times
[code]....
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May 14, 2010
Both server (web01), in DMZ, and client (app01), intranet, are Linux OEL5.5.
A few hints follows:
1- I ssh to web01, in DMZ, from a intranet machine on my desktop, export my DISPLAY, and try to bring up xclock; nothing happens.
2- traceroute from web01 to app01 fails.
3- NFS mount from web01, nfs server, to nfs client, app01, fails.
How should my network configuration on web01 or app01 be to make this NFS mount from web01 to app01 work?Each server has 4 NICs, I've only used eth0.
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Mar 1, 2010
Im trying to make an ubuntu server box my entrypoint to my networking. Meaning itll function as a server, a firewall, and a gateway. so i already installed dhcp3 and a dns server.
I have 2 ethernet cards in it. So now i wonder, should i the second card into a router's modem/wan port and make the router a switch? or should i plug it into one of the routers lan ports?
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Mar 29, 2010
I have a 14TB raid, file system is read-only and I am trying to run e2fsck -B -p -C -v -y /dev/sdb1, it goes through, but fails and says bad block/inode or fails to transfer, something like that.Is there a way I can get this to run successful, this is a production storage server, its critical.
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Jul 25, 2010
I am running a server that is mostly headless, but does run the Gnome environment (I have ubuntu-desktop installed). I usually administer it via VNC over SSH. My problem is that when I reboot the system over SSH, the system fails to fully load the GUI, which prevents me from connecting via VNC (although SSH still works).
When I connected a monitor and rebooted, the system booted up fine. It appears that the GUI will not load without an attached monitor, which never happened before in previous Ubuntu versions. I do use many commands but prefer a GUI for certain tasks and visualization of my work since my system has the resources to spare. Running Lucid Lynx
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May 13, 2010
I have a "friend" who hosts a couple of websites that I maintain. I have always used filezilla client to connect and update the files on the website.I lost access for a little while and he said that "The profiles had accidentally been dropped".He reinstated everything but now I cannot complete a log on session. I maintain several other websites which have the same PURE FTPd server at their end and I can connect to these OK.The delicacy of the matter is that, with no changes at my end, and my other sites working, logic suggests that something has changed at his end. I have very patiently worked through all his suggestions but to no avail.I can't suggest that he is at fault when he claims expertise in the field and I am a complete lamer when it comes to FTP.
I wonder if anyone would be kind enough to review the log on result below and see if they can throw some light on the situation for me.(I have anonymised the IP address and other information for security reasons)
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May 10, 2010
I am trying to connect to a windows 2000 VPN server at work, with my current settings in DOES connect to the VPN and i can ping the domain server which is 10.1.1.2 but the first issue is i cannot ping the other computers on the network(via hostnames) can't remember the ip address of the other machines . second issue is when the connection is established and i RDP into 10.1.1.2 ok great i am connected to the server but any interaction in the RDP session even moving the mouse on the screen kills the session and the VPN connection fails.
Running Ubuntu 10.04 LTS 64Bit
Image of current settings in network manager:
Syslog:
Code:
May 11 12:08:04 oliver-desktop NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...
May 11 12:08:04 oliver-desktop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started
[Code].....
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Sep 27, 2015
I am not able resolve any domain name but I am able to ping 8.8.8.8..Here is my config of /etc/network/interface
allow-hotplug eth0
iface eth0 inet static
address 10.50.243.141
netmask 255.255.255.0
broadcast 10.50.243.255
gateway 10.50.243.100
dns-nameservers 8.8.8.8
Here is the config of resolv.conf
nameserver 4.2.2.2
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Nov 29, 2010
I just set up an internal mail server for my office using Postfix, Dovecot and Squirrelmail. It works great except for one tiny problem. When I send mail, I address it to user@myoffice (no .com, .net, etc) and it works perfectly. However, somewhere in my work, I screwed up and for whatever dumb reason put myoffice.net somewhere in there and now the return-path always shows up as user@myoffice.net instead of just user@myoffice. Does anyone know how to fix the return-path so that when someone clicks reply it goes to user@myoffice? I've Googled and searched here without finding my answer, apologies if it's out there and I've just failed to see it. Rest assured I have done a couple hours of searching before finally asking for help.
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Jul 15, 2010
We're currently running a web site on CentOS 5.5 running Apache - Tomcat - Mysql. A part of the web site runs slowly or it would appear to be.
The part in question returns records from mysql about approx 200 - 400 rows of data.
The first point of call was the SQL database we've managed to fine tune this. The problem I have is with IE7 and IE8 when I run Firefox or IE6 SP2 the rows return in about 9 seconds. I use IE7 or IE8 and it takes about 20 - 25 seconds.
Could this be an APACHE problem?
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Jul 7, 2009
Have Fedora 11 running fine on my multi-Opteron system - but have stumbled into a problem which *might* have some significance (since it might relate to other system functions).When I tried to use nslookup (get the same error with dig, btw), I get the following error message:nslookup: error while loading shared libraries: liblwres.so.50: cannot open shared object file: No such file or directoryMy *guess* is that this is a bind-libs error, but I'm brushing up against the extent of my personal knowledge-base on this one.
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Dec 19, 2009
I am trying to install 11.2 on a Dell Poweredge 2550 - two processors,all scsi, raid disabled, ATI grahpics. Fails at "failure to mount clich file system" - reboot.
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Sep 1, 2011
I am trying to make my pc as a small web server. so i followed the steps below
1) Configure the router - Active Port Forwarding
Private IP Protocol Type Public Start Port Public End Port Connection 192.168.1.3 ALL 78 78
[Code]....
However, when i am trying to use public ip. it goes to the router's configuration page.
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