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

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How to check if port forwarding is enabled?

I have just set up a DNS server for my own network, and many guides online suggest to make sure that port forwarding on port 53 is not enabled. The thing that is not clear to me is this: should I ...
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1answer
784 views

Host home.lan.home.lan not found: 4(NOTIMP) error in bind9 (DNS)

I have been following this guide to set up a DNS server using bind9 on Ubuntu 12.04, but after all the configuration, when I run host -l home.lan I get the following error: ; Transfer failed. Host ...
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1answer
122 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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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
395 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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60 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
533 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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125 views

Postfix/devcot MailServer - not receiving emails

I'm new to linux and unix in general, I've worked with a shared hosting provider over the years where everything was setup for me, including email. I'm now trying to create my own mail server in my ...
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1answer
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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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4answers
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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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3answers
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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 ...
5
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1answer
205 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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162 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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4k 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
19 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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0answers
833 views

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
48 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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1answer
362 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
64 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 ...
2
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1answer
126 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
3k 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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3answers
2k 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
277 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
162 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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1answer
817 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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1answer
141 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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108 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
88 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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3answers
12k 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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669 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
136 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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1answer
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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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3answers
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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 ...
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1answer
213 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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1answer
746 views

How do I make dnsmasq obey the order of servers in resolv.conf

here's the generated resolv.conf # Generated by resolvconf nameserver 127.0.0.1 nameserver 208.67.222.222 nameserver 208.67.220.220 nameserver 192.168.1.1 what's going on in the log appears to be, ...
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3answers
539 views

Can I set my Debian box to use OpenDNS nameservers if it uses DHCP?

I have a Debian box with this in /etc/network/interfaces: auto eth0 allow-hotplug eth0 iface eth0 inet dhcp auto wlan0 iface wlan0 inet dhcp wpa-ssid NetworkName wpa-psk NetworkPass and ...
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2answers
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URL with hostname doesn't work but it works with IP Address

I have a very basic question here. This thing is puzzling me a little bit. I have one Ubuntu machine which is running 12.04 and I am connecting to that machine from putty in my desktop (which is ...
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1answer
119 views

Run domain on tomato/dd-wrt

it is there any way to run a domain on my router instead of running dyndns or other alternatives (Dynamic DNS) etc. on tomato or dd-wrt firmware ?
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DNS reverse query

When I do reverse DNS queries with IP address that I obtained from DNS query of one website, it shows many different domain names, why is it so? I thought if I do the reverse DNS query I will obtain ...
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1answer
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DNS Domain Issue [closed]

we are maintaining our DNS account to GoDaddy DNS Provider for our servers, Right now we have an problem, If someone has to register domain or sub-domain from any of other DNS provider or GoDaddy DNS ...
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1answer
69 views

How to resolve a hostname via nsswitch?

I want to test in a script whether a hostname resolves to something other than 127.0.0.1 as a pre-flight test for an install script. The tools I know (dig, nslookup) specifically query DNS. In my ...
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2answers
1k 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 have imported all of the DNS zone files using NamedManager (a web ...
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3answers
2k views

/usr/bin/host not picking up changes to /etc/hosts even after reboot

I have a Ubuntu Server 12.04 (amd64) machine on which, when I change /etc/hosts, the changes aren't picked up, even after a reboot. I am using /usr/bin/host to test, but none of the other programs ...
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2answers
65 views

Previously resolved hostnames

Is it possible to find previously resolved hostnames in linux? I have a host that I can currently not resolve, but I have resolved it earlier and would like to know which ip was resolved to.
2
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1answer
613 views

Dnsmasq white list for specific clients on network

I'd like to use dnsmasq to set up a white list for certain clients on my network. For instance, I'd like to have these rules for clients in the range 192.168.1.10 - 192.168.1.20: no-resolv ...
3
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1answer
137 views

Local DNS Server Refuses to Ask itself for DNS

I am running Debian 7 and have set up a DHCP and DNS server. Everything is working nicely, except for the server itself not following the DNS entries in BIND. The problem is that /etc/resolv.conf is ...
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3answers
272 views

Why do two Ubuntu systems in the same network behave differently in DNS resolution?

I have two systems, both running Ubuntu 12.04, which are within the same network (connected by hubs without routing logic). Both systems are configured quite similar, but not identical. In particular, ...
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2answers
483 views

Converting Webserver Logged IP Addresses to DNS

I'm trying to use a bash script to process a webserver log file and replace any IP's it finds with their corresponding DNS hostnames. An example entry of a single line from the log file is: ...
5
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1answer
247 views

getaddrinfo() from shell? [duplicate]

When you call ping name.domain, it goes through both /etc/hosts and the DNS resolver to obtain an IP. It could be an IP hard-coded in /etc/hosts, or it could be one from the DNS server. It does so by ...
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3answers
238 views

Debian cannot SSH to OS X by hostname (Windows OK)

I've seen some questions asking why xxx can't connect to MyMacName.local, which answer regarding Avahi as a requirement. I don't think I am in the same category as I can successfully connect to a ...