Translates domain names to IP addresses. DNS stands for Domain Name System.

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315
votes
13answers
194k views

How to clear/flush the DNS cache in Google Chrome?

As you probably know Google Chrome has its own internal DNS cache. Is there a way to clear it without having to wait for the time out or close the browser?
101
votes
5answers
11k views

How should I choose my DNS?

When I have to choose my DNS I think that I should consider: Speed Reliability Privacy Control (reports and stats) The main options that come to my mind, and how I weigh them according to the ...
37
votes
1answer
11k views

If Google provides public DNS 8.8.8.8 and 8.8.4.4, who provides 4.2.2.2? [closed]

I was always told by colleagues 4.2.2.2 appears to work faster and have to combine that with Google's public DNS. Basically using 8.8.8.8 as primary and 4.2.2.2 as secondary. However, Google only ...
33
votes
4answers
49k views

How to clear DNS cache in Ubuntu?

I'm having problems related to DNS solving in my Ubuntu 9.10. Prior complaining to my ISP I would like to refresh my local DNS cache, like in Windows we do ipconfig /flushdns. How can I do that in ...
25
votes
9answers
29k views

Why is 'ping' unable to resolve a name when 'nslookup' works fine?

On my Windows XP workstation, I can find the machine I want to connect to in DNS with nslookup: nslookup wolfman Server: dns.company.com Address: 192.168.1.38 Name: wolfman.company.com Address: ...
25
votes
6answers
54k views

Is there a way to get the complete zone file for a domain without contacting its host?

I know that it's probably (no longer) possible because of abuse, but I want to check nonetheless. Is there a way for me to obtain the company zone file for a domain myself, without having to contact ...
23
votes
10answers
69k views

Running DNS locally for home network

I have a small home network that just got larger ( New roommate, My existing roommate got a laptop (on top of her computer)j, my friends coming over with laptop, etc ). I'd like to run a local DNS ...
18
votes
3answers
3k views

Why can I ping google.com, but not nasa.gov?

Why can I ping google.com, but not nasa.gov? I have to ping it like this ping www.nasa.gov Is it because of DNS record of NASA? Also how does a ping response time improve? ping google.com time ...
18
votes
2answers
880 views

How does http://to./ work?

So I noticed this on Jeff's twitter. They don't have a tld, it seems? How've they done this? Magic, bribery, or did a no-tld tld open up recently?
15
votes
3answers
32k views

How can I direct a query to specific DNS server?

I would like to issue a query to a specific DNS server, whose IP address I know. It doesn't really matter if it's on Windows or *nix. In Windows I can do something like: C:\Documents and ...
14
votes
7answers
8k views

Is it possible for many domain names to share one IP address?

Is it possible for many domain names to share one IP address? For example, www.xjtl.com, www.fmie.com, sdmfl.com, etc. Hundreds of domain names share just one IP – when you do a DNS query for each of ...
14
votes
4answers
9k views

How do I get the mx records for a domain from *nix command line?

What is the best way to lookup MX records for a domain from the command line?
14
votes
3answers
4k views

Should I use Google Public DNS service for my desktop?

What are the pros and cons of using Google Public DNS resolution service?
13
votes
3answers
3k views

How to know if your computer is hit by a dnschanger virus?

The Federal Bureau of Investigation (FBI) is on the final stage of its Operation Ghost Click, which strikes against the menace of the DNSChanger virus and trojan. Infected PCs running the ...
13
votes
2answers
3k views

How will home networks work in the IPv6 world?

Right now, I have a home network setup behind a Netgear router. That router has a public IP address I get from Comcast. I also have a computer setup on my home network running Linux that runs a DHCP ...
12
votes
2answers
15k views

How to do DNS through a proxy in Firefox?

I am using Firefox 3.5.7 with FoxyProxy. I have an ssh tunnel forwarding 8080 through to an HTTP proxy server on the other end. With FoxyProxy, I send work traffic direct but everything else goes ...
11
votes
3answers
18k views

Change DNS Server From Terminal (or script) on Mac OS X

How can I change my DNS server from the Terminal on Mac OS X? [I need this because my DNS is not working correctly with my VPN. Sometimes it's using the DNS for my main connection, and sometimes it's ...
11
votes
6answers
11k views

VPN: Does all traffic get routed through the VPN when I am logged in?

If I log into a slow VPN with only a 15k/s connection, when I try to go to kernel.org or some other site to download something, is everything getting routed through that other network? (so my max ...
11
votes
3answers
3k views

MacBook can't use internet, but nslookup and ping both work

I have a user with a new high-end MacBook Pro that can't use the internet. He can connect to either our wired or wireless network and do things like browse file shares, but can get no further. When ...
11
votes
1answer
902 views

All invalid hostnames resolve to localhost in my browser. What is going on?

Update: jump to the end of this question for the happy conclusion to this epic tale. Note: I have IIS7 installed locally for web development. This is what happens in my browser for random sites: ...
10
votes
18answers
8k views

Can the Internet work without DNS?

If we have an IP-based system of identifying nodes on the Internet why is there a need for DNS?
10
votes
5answers
3k views

Why does my browser take me to the WRONG site?

Sometimes I type nytimes.com and my browser takes me to usatoday.com. Sometimes google.com takes me to Bing.com. Sometimes I enter online.wsj.com (Wall street Journal), but I'm taken to ...
10
votes
1answer
1k views

Why does my browser try to open ads from fwdsnp.com?

When I browse to some retail websites, my browser briefly directs to fwdsnp.com. From there it tries to open a popup and then forwards to the site that I actually want. I first noticed this with ...
10
votes
1answer
17k views

How do I alias a hostname in windows?

Same question as How to I alias a hostname? but for windows, particularly windows 7 I don't want to specify an ip address (hosts file) just an alias so that \\mylaptop points to \\longcomputername ...
10
votes
2answers
7k views

OS X >10.6.5 DNS Lookup Order with VPN

After updating to OS X 10.6.5 (from .4), applications don't seem to be looking up host names in the correct order (according to the service order in Network Preferences) when my VPN is connected. My ...
9
votes
4answers
3k views

How is a subdomain passed to the webserver?

I know that dns resolves an address like example.com to an IP address like 11.22.33.44, but I'm a little confused about how subdomains are resolved, so that when you type http://subdomain.example.com, ...
9
votes
4answers
7k views

Bash: lookup an IP for a host name, including /etc/hosts in search

Ubuntu 10.10+ In my script I need to lookup an IP for a given host name. If that name is listed in /etc/hosts, then command should print IP from /etc/hosts, not from DNS server. What commands I ...
9
votes
9answers
51k views

Windows 7 not appending connection-specific DNS suffix

I have a Windows 7 machine I'm trying to setup for development. Typically we access our development domains using a URL like user.site.dev. The DNS is setup for user.site.dev.sd.ourdomain.com. I am ...
9
votes
3answers
33k views

Is there a good DNS server I can install on Windows 7 for a LAN? [closed]

I have a few computers on my LAN, and now I'm getting tired of remembering the IP addresses all the time, so I would like to start using DNS names on my LAN. I have a heterogeneous network with ...
9
votes
6answers
15k views

Lion / name resolution order

(this issue went away for me with the 10.7.1 update - /etc/hosts now works as always for me) I've updated my Mac to Lion and now I notice that /etc/hosts is consulted last, even after DNS. This is ...
9
votes
2answers
4k views

How can I check if a domain uses DNSSEC?

DNSSEC has been deployed on some topdomains now. But how could I see if a site/domain is using DNSSEC? Is it shown in the browser? or is there any windows or linux command to see it? or a tool for it? ...
9
votes
4answers
783 views

Can I rely on my own DNS server in case of a global DNS blackout?

On March 31st 2012, Anonymous plan to take down the 13 root DNS servers that power the Internet: http://pastebin.com/NKbnh8q8 ... and I don't want to even notice if it actually happens. Assuming ...
9
votes
3answers
5k views

All my browsers suddenly don't support Javascript files anymore?

I'm experiencing the same issue as this question, which seems to be unresolved. I'll provide more detail, sot that this qualifies as a better representation of the issue. It all started after moving ...
9
votes
6answers
2k views

Is it possible to find out which upstream DNS server my router is querying? (just using dns tools)

Ok, here is the setup: I have a local router which advertises itself as the DNS server over DHCP. The DNS resolver on the router just forwards the requests to the ISP nameservers and caches the reply. ...
8
votes
3answers
2k views

Is the www in web addresses a subdomain? [duplicate]

Possible Duplicate: Whats the purpose of the WWW subdomain? I read about sub domains at w3schools, but Wikipedia says something different. The w3schools gave the example of www being a sub ...
8
votes
9answers
13k views

Can ping fine but no browsing

I've got a laptop which has a verified internet connection. I can ping www.google.co.uk and receive a response no problem. However IE, Chrome, Firefox, MSN messenger cannot connect to the internet. ...
8
votes
1answer
6k views

How does Tunlr work?

For those of you not in the US, Tunlr uses DNS witchcraft to allow you to access US-only (and UK-only stuff like BBC radio online) services and Websites like Hulu.com, etc. without using traditional ...
8
votes
2answers
15k views

What does authoritative DNS server mean?

What does authoritative DNS server mean? Can someone please explain it to me in a shorter way?
8
votes
3answers
4k views

Mac OS X DNS lookup seems to be messed up - but only at work

Mac OS X DNS lookups take forever from Safari and other applications that use mDNSResponder. The same lookups work fine if I use nslookup from the command line, and they also work fine from my iPhone ...
8
votes
3answers
1k views

In Google Apps, is there a way to completely hide the fact that you're using Google?

If I have a domain in Google Apps: http://mydomain.com If I host this under Google Apps, I can have my documents, calendar, and mail at sub-domains: https://docs.mydomain.com ...
7
votes
3answers
23k views

How can I set my DNS settings using the command-prompt or PS?

Through the CLI (either cmd.exe or PowerShell) on Windows 7, how do I edit the TCP/IP DNS parameters for a specific network adapter?
7
votes
2answers
2k views

Services that just return your public IP as text

I'm writing a script that does dynamic DNS updates for me, but my server is behind a router, and so I need to use a web service to determine my public IP. So far I've found this one which returns ...
7
votes
1answer
376 views

how to clear Window DNS cache

My router reset and my ip address changed. DynDNS was updated with the new address automatically. But windows still pings the old address. How do I clear the DNS cache in Windows Vista?
7
votes
1answer
435 views

Where can I obtain the full DNS zone files for all TLDs?

Is there a way to get full zone files for all TLDs? I have managed to get my hands on a few (.com, .net, .org), but I'd really like to get some of the country-specific ones for having a play around ...
7
votes
2answers
8k views

How does circumventing IP restrictions through DNS work in the case of hulu.com?

I just heard from an australian guy that it is possible to watch hulu.com from Australia (which is actually restricted by country IP checks) by using certain DNS servers. Now I was wondering, how ...
7
votes
2answers
2k views

10 second delay for .local TLD in Mac OS X Lion

Our company network uses xxx.companyname.local for all the servers on our local network. Whenever I access one of these servers on my Mac, I have a 10 second delay. I have found out that this delay is ...
7
votes
2answers
4k views

How to get VirtualBox VMs to use host's DNS?

I use VirtualBox for my VMs. My office network setup is wireless, i.e. I connect to my company's WiFi network, which has a local DNS to resolve local names (such as something.mycompany.com going to ...
7
votes
1answer
714 views

Tcpip error: Request failed due to all such ports being in use

Today my machine stopped being able to access the internet. I can still access some local network resources. When I looked in the error log I saw following tcpip warning: A request to allocate an ...
7
votes
2answers
2k views

Maximum number of DNS servers in Windows

What is the maximum of nameservers one can enter in Windows? Are there differences in different versions? Linux has a maximum of three, which is set in /usr/include/resolv.h: # define MAXNS ...
7
votes
3answers
9k views

How to set custom DNS server for Chrome browser?

I have local DNS server thats resolve all urls *.domain.tld to 127.0.0.1. Also I have the production server with same address *.domain.tld. They have the same names, because subdomains are interact ...