Domain Name System for computers, services, or any resource connected to the Internet. It translates domain names meaningful to humans into the numerical identifiers associated with networking equipment for the purpose of locating and addressing these devices worldwide.

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2
votes
1answer
4k views

Can not restart dnsmasq due to “ configuration syntax check [fail]”

I restart dnsmasq and get $ sudo /etc/init.d/dnsmasq restart * Restarting DNS forwarder and DHCP server configuration syntax check [fail] From where and how can I troubleshooting?
17
votes
7answers
51k views

How to view the DNS address assigned by DHCP?

How to view the DNS address assigned by DHCP? ifconfig can not show it. $ ifconfig -a eth0 Link encap:Ethernet HWaddr 90:e6:ba:22:6a:f2 inet addr:192.168.1.111 Bcast:192.168.1.255 ...
0
votes
1answer
393 views

Ubuntu Server Takes time to resolve website name but not IP address in wget command

I have ubuntu server 12.04 LTS . When i fetch something over the internet using wget command. It easily starts when i give address like wget 100.100.100.100/index.html means ip address. it immediately ...
0
votes
1answer
1k views

How to configure DNSv6 on a LAN without internet access?

I have a LAN of IPv6 enabled hosts. I would like to setup a ubuntu as DNSv6 server for the local LAN addresses (there is no internet/tunneling stuff). I could manually edit the etc/hosts file for ...
3
votes
0answers
58 views

How do I flush DNS settings in ubuntu, like we do in Windows? [duplicate]

Possible Duplicate: How do I clear the DNS cache? I am having some issues with my Internet. The ISP wants me to reset/flush the DNS settings. So my question is how do I flush the DNS settings ...
1
vote
1answer
1k views

Bug fix for the ddclient “Invalid IP” error not working

I'm running Ubuntu Server 12.04 on a mid-2009 MacBook Pro and using ddclient to update my IP address at www.no-ip.com. After installing ddclient according to the instructions here I had one successful ...
0
votes
1answer
247 views

Postfix DNS problem

So i get interesting problem with postfix which is it cannot sent emails with its own SMTP service! I need to use third party smtp server which is bad option. That error log is at friendpaste: Mail ...
0
votes
0answers
604 views

Ubuntu 12.04 desktop ISO CD boot under VirtualBox, no network

I boot the Ubuntu 12.04 desktop ISO CD with VirtualBox, but get no DNS. I.e., eth0 has its IP address, but DNS resolving always fails. I tried VirtualBox bridged networking, then NAT, but for both ...
5
votes
3answers
211 views

Use same dns server for all (future) connections

I'm wondering if it is possible to specify, that all connections (even future, like when using wifi at some other place (=different SSID)) will be using pre-defined DNS server When I have some (...
2
votes
2answers
4k views

Trick Ubuntu into resolving a domain name locally

I have an Ubuntu box that I use for all sorts of things. One thing I really want to do is redirect a sub domain to a local script. For example thisbit.example.com should actually show the content ...
2
votes
2answers
2k views

Is there a way to make dig report the actual name server rather than 127.0.0.1? [duplicate]

With resolvconf, dig always shows the loopback address. Is there anyway to see which server is actually answering?
1
vote
1answer
1k views

Running 12.04 as a gateway - resolvconf, dhclient and dnsmasq integration

I have a gateway server which is set up originally with Ubuntu desktop 12.04 - perhaps a mistake, I don't know, something to bear in mind. I ripped out network-manager and now want to get resolvconf,...
1
vote
2answers
2k views

DNS resolution in ubuntu 12.04

I use a VPN client to access my company's intranet. It used to work fine with older versions of Ubuntu. But on 12.04 it doesn't. It is able to connect but I do not see any packet exchange happening, ...
1
vote
2answers
753 views

How to configue a DNS server statically?

I am setting up an Ubuntu (12.04) Server with a single statically-configured network interface. Every time I reboot /etc/resolv.conf seems to get reset to empty. Where can I put my DNS server address?
2
votes
1answer
377 views

DNS issues with 12.04, apt-get, and openssh

On a fresh Ubuntu 12.04 installation, we noticed that we were having issues with openssh as it was constantly breaking the connection randomly after a period of time. After doing some debugging, we ...
3
votes
0answers
465 views

DNS servers not correctly set in VPN

I have to use an OpenVPN network to work from home, and I occasionally have problems getting DNS to resolve. The problem comes and goes, and I can't reproduce it reliably. I took the OpenVPN config ...
0
votes
1answer
2k views

Strange network issue; works on windows, but not on ubuntu, works on campus wireless, but not at home

I have a broadcom device using dell laptop that can dual boot into windows 7 and ubuntu 12.04 LTS. I have no trouble connecting to the internet using the Windows 7 side, but on Ubuntu firefox and ...
3
votes
4answers
9k views

How to make subdomains point to different local IP addresses?

I have a domain name mydomain.com which points to a static IP address. I have configured in my modem so that all request to port 80 of this static IP will come to my local computer 192.168.1.100 (web ...
2
votes
1answer
722 views

Cannot ping localhost after a half day of uptime

This just started like 4 or 5 days ago. I'm running Ubuntu 12.04 desktop, and after about 12 hours of uptime it seems the loopback device just stops working. If I do an ifconfig, it looks like it's ...
1
vote
1answer
3k views

ubuntu 12.04 server doesn't resolve local domain name

After apt-get upgrade this morning, my Ubuntu 12.04 web server does no longer resolve a domain name hosted on it. I also received the error message: "resolvconf: Error: /etc/resolv.conf isn't a ...
2
votes
2answers
9k views

'/etc/hosts' , http links are redirecting, but https links are not redirecting

I edited /etc/hosts file and entered below information : 127.0.0.1 test.com //working 127.0.0.1 https://test.com //not working . from the above info, http://test.com is redirecting to 127....
0
votes
1answer
504 views

DNS not working over DSL

I connect to Internet via a PPPOE connection that i configured manually as below: /etc/ppp/peers/hamyar #hamyar: noipdefault defaultroute replacedefaultroute hide-password noauth persist plugin ...
4
votes
1answer
49k views

How to Disable External DNS recursion?

I know that to disable recursive queries in BIND, I need add the following lines to the options section of /etc/bind/named.conf.options allow-transfer {"none";}; allow-recursion {"none";}; recursion ...
0
votes
2answers
1k views

Why doesn't this custom static IP network configuration work?

I installed Ubuntu server 12.04. I configured my network like this: auto eth0 iface eth0 inet static address 121.127.36.164 netmask 255.255.255.0 network 121.127.36.0 broadcast 121.127.36.255 gateway ...
3
votes
1answer
2k views

How to address ssh-server with a subdomain for remote access?

I am trying to set up ssh-server on my Ubuntu 12.04 VM (running in VirtualBox on Mac OS X 10.7). I have a domain name, call it foo.com, and I'd like to make ssh available via ssh to linux.foo.com. (I ...
2
votes
2answers
4k views

resolv.conf containing 127.0.0.1

I have just installed Ubuntu 12.04 on a dual-stack network (with managed IPv6 configuration). I would like to verify if the DNS resolver options received from DHCP and DHCPv6 servers are correct. ...
0
votes
1answer
253 views

Setting up private nameservers

I am wanting to setup private nameservers; like ns1.domain.com & ns2.domain.com and I am wanting to make my ubuntu server to point these nameservers to this machine. So now to manage DNS for a ...
1
vote
1answer
3k views

Internet connection not working although it says it is connected

I have a Toshiba z830 with ubuntu 12.04. I could use without problems the DSL connection (I have no router, only a modem) at home until a couple of days ago: It stopped to work when while connected ...
0
votes
0answers
44 views

Resolve specific IP addresses to localhost in 12.04 [duplicate]

Possible Duplicate: How do I add a DNS server via resolv.conf? I used to simply add static DNS entries in my /etc/hosts file. This is not working with 12.04. How does one add static DNS ...
2
votes
1answer
33k views

How to setup DHCP Server and Dynamic DNS with BIND?

Possible Duplicate: How to make my pc a DNS server in local network with no-internet access? I have installed the two servers (dhcp & DNS) what i need is to make the dns dynamically ...
3
votes
1answer
4k views

vpnc connects but does not set up nameservers in /etc/resolv.conf

I am not a big Ubuntu guru, running 12.04 LTS version. I need to connect via vpnc from university to the work network. Logging in works fine, however I cannot reach any machine behind the VPN. Also, ...
2
votes
1answer
2k views

DHCP is mangling my PTR records in DNS

I originally posted this in LinuxQuestions http://www.linuxquestions.org/questions/linux-server-73/dhcp-is-mangling-my-ptr-records-in-dns-4175412344/ without much luck, so I'll try here. DHCP is ...
1
vote
1answer
213 views

some programs not resolving hostnames

Ubuntu 11.10, Kernel 3.0.0-20.34 Both Chromium and Firefox are stuck "waiting for www.whatever.com" to load until they time-out. Both of these browsers can load these websites if I navigate to the ...
1
vote
1answer
326 views

wired resolves dns but wireless dont

My wireless won't resolve dns but my wired connection does. I've tried: $ sudo /etc/init.d/networking restart and: $ sudo dhclient -r $ sudo dhclient as I saw at that question. But it didn't ...
4
votes
6answers
4k views

How do I enable DNS caching in the NetworkManager-controlled dnsmasq?

Ubuntu Desktop 12.04 uses dnsmasq to perform DNS lookups, but it is not configured to cache these results. (I have checked this by using dig to resolve names and I do not see a large improvement in ...
3
votes
1answer
648 views

How do I create a psuedo-domain through bind on Ubuntu 12.04?

I've done some prerequisite reading on DNS and BIND via O'Reilly's book. My goal is to have a local DNS server (i.e. seldon.foundation) that resolves local names (i.e. *.foundation) but forwards the ...
1
vote
1answer
224 views

Domain resolution - local first then external

I would like to know how I can configure my dns settings so that domain is resolved locally first, then if not resolved it goes to external DNS. I had this working before, I am using Ubuntu through a ...
95
votes
7answers
274k views

Command-line to list DNS servers used by my system

Is there a command to list dns servers used by my system? I tried $ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE ...
1
vote
4answers
5k views

WIreless connects but Internet stops working on Ubuntu 12.04 64 Bit and Broadcom 4313

I'm running Ubuntu 12.04 64 Bit on a HP Pavilion dm4. It has a Broadcom 4313 Wireless Adapter and a Realtek RTL8168D/8111D Ethernet Adapter. I haven't been able to get consistent internet access from ...
26
votes
2answers
56k views

How to use host names rather than ip addresses on home network?

I've a small home network up and running and managed to set up ssh. Can anyone tell me what I need to do to refer to one computer on the network from another by host name rather than IP address (which ...
0
votes
1answer
1k views

Kubuntu 12.04 - DNS Issues

Starting yesterday (6/11/12), I've been having many network problems. When requesting a page in chrome, the page hangs on "Sending request" and then will eventually timeout. I'm within a VPN that has ...
2
votes
2answers
2k views

How to opendns on router with dynamic ip

OpenDNS is almost completely useless with a dynamic ip and most people have dynamic ip addresses. There isn't even a decent client for Linux to update your IP. There is a script you can install ...
1
vote
1answer
4k views

Mail Server not working?

I am trying to setup mail server since a long time but as I am new to Linux I have unsuccessfully configured it to the best as I could but now I need assistance. I have installed it using the links ...
25
votes
6answers
25k views

What Can Be Done To Secure Ubuntu Server?

I have a project to secure Ubuntu Server as much as I can. The server is a web hosting server. The server will be running LAMP , Mail , and DNS.
4
votes
2answers
28k views

How do I allow all possible IPs for Gmail servers through my ufw firewall?

I am currently using the following rule: ufw allow out from my_local_ip to any port 587 This is a little too lax for my liking. I would like to tighten it up and restrict it to only gmail's smtp ...
2
votes
1answer
405 views

How to auto-install runlevel control for existing service/daemon?

Need to install a service/daemon (in this case bind9, a DNS service) runlevel control, aka "rc" control (/etc/rc*.d and such). bind9 came pre-installed on my 11.04 system, but without aforementioned ...
3
votes
2answers
5k views

Why do none of my local servers resolve?

When I try to ping or browse using a web browser certain domains names that we host on our local network, it does not work. Yet, dig and nslookup correctly return their details. What do I need to do ...
36
votes
10answers
250k views

How do I configure my static DNS in interfaces?

I am using Ubuntu 12.04. My /etc/network/interfaces file consists of: # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface ...
8
votes
1answer
44k views

Can not access Internet (DNS names do not resolve) after update today

I have been using Precise for a few weeks now for work with no problem. Today, I am not able to access any website using either wired or wireless connections. I installed the updates today which ...
1
vote
1answer
2k views

How do I stop OpenDNS from redirecting single-word searches?

Every time I search for a single word in the Firefox address bar I am redirected to OpenDNS Guide search rather than my default search engine. How do I stop this? I have tried changing Keyword.URL in ...