Domain Name System (DNS) is a service that provides the resolution of host names to IP addresses.

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Split DNS (bind9), match-clients any doesn't work?

I've been fighting with this for the last few days. A few of my entries have external and internal IP's. My internal network is 10.0.0.0/8. When I nslookup pc1.clase.net internally it responds with ...
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1answer
192 views

Configure multiple interfaces with different hostnames using DHCP and DNS

I have a machine running Ubuntu 12.04 Server with two interfaces connected (eth0, eth1) to the network. Our network is set up so that a FreeBSD based DHCP server hands out leases and registers the ...
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1answer
32 views

Make the DNS server update my host name

I have some sort of DNS server running on my router (running Asuswrt-Merlin, and I can run commands from another Linux computer by host name, i.e., ping web-server. However, when I change settings on ...
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1answer
415 views

Command/scripts to check the Reverse DNS Lookup time

I am working on a project in which one master communicates with numbers of slaves. For that it has to make connection with hosts in network. But sometimes it hangs. I think that the reason behind is ...
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44 views

Ping IP works, nslookup fails. New Kernel

I am compiling my own 3.14 kernel. I fear I may have left out some important networking feature to get DNS working. I can't resolve domain names. I can ping my DNS server. I can resolve using that ...
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1answer
259 views

Opendns setup failed. How to fix it?

I have problems trying to configure OpenDNS. I have contacted OpenDNS support but they did not answer. I cannot access websites like Twitter and Facebook. I tried welcome.opendns.com (did not ...
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5answers
3k views

How to overcome libc resolver limitation of maximum 3 nameservers?

Suppose I work in environment with number of domain changes and slow propagation. I want to test domain configuration immediately after setting change but the propagation is slow. So I want to add ...
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3answers
20k views

How to flush local DNS cache in CentOS

(I am aware that googling this question gives me tons of stuff, but literally none worked) I'm looking for a way to flush the local DNS cache on a Centos 6 system, it is not running any DNS server or ...
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1answer
54 views

How do I determine where DNS requests fail in the TCP stack?

I have the networking setup described here: Why is this static route not taking effect? Currently, I can ping my DNS server but all DNS requests fail: ~$ ping 130.35.249.52 PING 130.35.249.52 ...
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1answer
15 views

NSD Zone file wrong resolution

I've set up NSD with the following zone file: $ORIGIN ldom. ; my "Local DOMain" @ IN SOA lserver root.lserver ( 44 ;serial ...
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1answer
35 views

Cannot install BIND dns with yum on Oracle Enterprise Linux 6.1

I am currently using Oracle Enterprise Linux 6.1 to use for Oracle RAC. However I am stuck at installing BIND (DNS Server) at the VM I've set up. I've used the following command: yum install ...
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1k views

unable to start named service

Whenever I try to run the named service, I get the following even though my permissions and folder ownership is all fine: [root@f13 ~]# service named start Starting named: Error in named ...
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1answer
50 views

Debian cannot resolve hostnames

I have a problem resolving host names on Debian running on vmware. It just stopped working out of the blue. Somewhere after uninstalling percona server and deleting /etc/mysql . Initially it thought ...
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3answers
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Can't connect to to internet. Debian Wheezy, pinging DNS address works

I have booted Debian Wheezy from SD card on a Beaglebone Black board. Version: debian-wheezy-7.0.0-armhf-3.8.13-bone20.img.xz, from http://www.armhf.com/index.php/download/ I have set up my ...
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1answer
30 views

How do I generate SSHFP records?

I need to setup SSHFP records in the DNS for my host. I have done some searching but I haven't found any good example. What are SSHFP records? What does SSHFP records look like? How do I create ...
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1answer
336 views

Firefox unable to access domains defined in /etc/hosts if Network Manager is disconnected from a network

For developing web sites, I define test domains in /etc/hosts : 127.0.0.1 example.org I can then access example.org in the browsers. However I when the Network Manager is not connected to any ...
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1answer
835 views

Binding domain name to Apache Virtual host on VPS

recently company I work for has rented VPS. Now i need to have multiple websites hosted on this VPS, that is not a problem, I'v set up virtual hosts, databses, etc. Now i wanted to test it, see if I ...
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2answers
61 views

alternative to nslookup in rhel7?

nslookup does not come preinstalled in RHEL 7 Beta. I noticed even dig and host was not pre installed. I read couple of links which mentions nslookup is dead/deprecated, so is there an alternative for ...
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1answer
211 views

BIND9 as a DNS server refuses requests

I am trying to set up a DNS server on Amazon Linux using BIND9. It has to act as a master nameserver for a lot of domains. I am going desperate... I have imported all of the DNS zone files using ...
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1answer
57 views

What is the effect of setting the timeout value to 0 in /etc/resolv.conf?

In order to fix a problem with DNS resolution in a particular customer environment, their admin has suggested adding options timeout:0 to the /etc/resolv.conf file on their CentOS 5 server. The man ...
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1answer
33 views

How to check if all of dns resolvers are working? [closed]

How can I check if all of dns resolvers are working under linux console?
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1answer
1k views

Using DNSMasq for Local Hostname Resolution

I'm working on setting up a home intranet for me and my roommates. My idea is that we'll be able to store things like past utility bills in a place that's more accessible than a drawer in the kitchen ...
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1answer
97 views

CentOS 6 not regestering new hostname on Windows Server 2003

I rebuilt a Windows 7 Workstation with CentOS 6.5. The Windows 7 had a host name aaa attached to domain ddd.local. The new CentOS hostname is bbb. When I try to ping it: $ ping bbb ping: unknown ...
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1answer
15 views

configuration to listen-on different depending on the domain asked

I want to configure bind such that the host served differ depending on the domain asked. the use case is the following: it must respond to anyone if the requested domain is in the domain my server is ...
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4answers
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What is the point of sshd “UseDNS” option?

I know what it does, but i don't know why. What attack(s) does it prevent ? Is it relevant for all kind of authentication methods ? (hostbased, password, publickey, keyboard-interactive ...)
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1answer
17 views

Installing Arch on VM - DNS Issues

I have been following the Install Wiki and I have arrived at the part where I need to install X Server. My issue is that I cant install X because my DNS doesnt work. I can ping 8.8.8.8 just fine, ...
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apt-get update could not resolve addresses [closed]

When I run apt-get update (on Ubuntu 12.04) I keep getting these errors: Err http://security.ubuntu.com precise-security Release.gpg Could not resolve 'false' Err https://get.docker.io docker/main ...
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1answer
47 views

named starts but doesn't answer until reboot

I have a current arch linux arm running on raspberry-pi and bind 9.9.4.P2-1 from the community repository. I'm using this bind as a slave-nameserver for our internal network. I have enabled named ...
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2answers
973 views

Configuring ssh fingerprints on dns to replace known_hosts fails

The SSHFP records were generated on the ssh server as follows and then added to the zone in bind: $ ssh-keygen -r www.test.us. www.test.us. IN SSHFP 1 1 ad04dfaf343a93beeb939eed1612168f7eadbed7 ...
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1answer
26 views

Setting up Bind9 - lsb-base not in sources

I've been having real trouble installing Bind9 following this tutorial http://forums.debian.net/viewtopic.php?f=16&t=39146 When I get to entering these commands: apt-get -y build-dep lsb-base ...
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1answer
73 views

Change the DNS server in etisalat USB modem

I need to use the open DNS : 208.67.222.222,208.67.220.220 in my network connection. I use etisalat 3.75 USB modem HUAWEI in my Ubuntu 12.04 PC. I had tried to add this DNS in : ...
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1answer
41 views

zone delegation in Bind

I have a lot of zones defined in my DNS server. I need to delegate one particular zone to a foreign DNS server and I don't have access to my domain-registrar control panel, currently. Is there a way ...
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3answers
92 views

why host command return no SRV record?

I am a bit confuse here, I'm trying to establish a connection to Active Directory server from linux, someone told me to use this command: host -t srv zeus.company.com Assuming the Active Directory ...
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1answer
75 views

Why does dig take much longer than DNS query time?

I'm investigating slow DNS responses on Ubuntu, I have installed bind9 to improve times from local cache, but still something is odd. What could make dig wait for 10 seconds and say that query time ...
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1answer
234 views

Bind9 — How to find which programs are making which dns lookups?

Using bind9 on a laptop shows lots of nonsense domains when network connectivity is down: Oct 18 19:56:18 lap3 named[1536]: error (network unreachable) resolving './NS/IN': 128.63.2.53#53 Oct 18 ...
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1answer
56 views

OpenBSD with adsuck: nslookup works, other applications not

(The problem that nslookup works but other applications can't resolve name is asked very often, mainly for windows. I read a lot of these answers but none of them was applicable.) I use OpenBSD with ...
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1answer
127 views

Slow DNS resolve from curl/lynx etc

I have a strange issue with DNS resolving: Root of the problem is that I get curl errors: "Error executing HTTP request: name lookup timed out". Tried to ping some sites, all resolved fine (and fast). ...
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37 views

Arch wifi keeps dropping

I recently installed Arch, wifi has been messing around. Dropping and generally not connecting. I fixed it by ruling it was DHCP not getting a lease in time, I assigned a static IP and all is good. ...
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1answer
51 views

DNS not resolving using IP rule for dialup modem

I am running Ubuntu 12.04. I have a HSDPA USB Modem, with which I can successfully dial in. It works fine as well when I set the default gateway (remote IP address) in the main routing table. But I ...
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2answers
56 views

Combining different DNS servers

My company uses DNS servers that provide access to internal systems, for example "build.company.de" is resolved accordingly if one of the internal DNS server is queried. However, the internal servers ...
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4answers
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What DNS servers am I using?

How can I check which DNS server am I using (in Linux)? I am using network manager and a wired connection to my university's LAN. (I am trying to find out why my domain doesn't get resolved)
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3answers
273 views

Why can't I ping Google?

I can't ping google.com (unknown host). But I can ping IP addresses. I tried to ping the IP address of Google but it doesn't work. resolv.conf nameserver 8.8.8.8 nameserver 209.139.209.33 ...
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0answers
187 views

Getting Samba 4.1's “internal DNS” to update hostnames from dhcpd

Samba 4 comes with its own "internal DNS" which can be used rather than BIND. Since Samba 4's main new feature is AD replacement, I would figure that its DNS would function similarly to Windows ...
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2answers
2k views

debian, problem with DNS

When I type in "google.com," firefox tells me that the server is not found. When I type in the IP address of google, it works just fine. I was playing with this computer at another place and it ...
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11answers
62k views

How can I resolve a hostname to an IP address in a Bash script?

What's the most concise way to resolve a hostname to an IP address in a Bash script? I'm using Arch Linux.
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1answer
562 views

Why is sendmail appending my hostname to unknown destination domain?

I am testing the handling of mail bouncing. When I send a test email to a bad domain, for example: eric@blahblahfail.org, I get the following error in my log: SYSERR(root): ...
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1answer
169 views

Why do DNS queries fail if the first nameserver is not recursive?

I have a Linux box (Ubuntu server 11.10) inside a Windows Active Directory domain, and is joined the domain using likewise-open. The resolv.conf file looks like this: domain mydomain.com nameserver ...
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1answer
56 views

Mail Server Setup, MX Records, and Hostnames?

I'm a bit confused how mail servers work, and the process of setting them up. Say I have an domain called example.com, and I have an A record for it. I'll be using postfix/dovecot for this setup along ...
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4answers
494 views

How can I improve nscd's cache hit rate?

My Goal: Let nscd maintain a fairly large DNS cache in excess memory since I have it available. Description: I have a webserver that has a broadly dispersed but high-repeat user base. It has plenty ...
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3answers
214 views

How to disable DNS caching or override TTL for a certain hostname?

I've set up my own dynamic DNS service by using a script to automatically update the A record for a subdomain of one of my domains. The host with the dynamic IP address runs, among other things, a ...