The Domain Name System (DNS) translates Internet domain and host names to IP addresses.

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Implications of using DNS Forwarders instead of Root Hints

When redesigning an organizations DNS infrastructure, the question of using Forwarders instead of Root Hints comes up. What kinds of issues should I be aware of when the admins and designers start ...
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How can I protect myself against DNS leaks?

As discussed here, a DNS leak is where DNS lookups ignore your current routing (in the example of a VPN connection) and still end up going out over your normal internet connection. This can ...
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Does using Google DNS make extensions like AdBlock Plus useless?

As many of you probably do, I am not using my ISP DNS because of very low performance, and I am using Google's primary and secondary DNS (8.8.8.8 and 8.8.4.4) which are good speed-wise but, knowing ...
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To DMZ, or not to DMZ

So for an assignment, we need to create a scheme (and eventually also the set-up) of a couple of servers in a network. The 'networks' are: Internal network DMZ The internet And the servers we ...
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Does DNS pinning protect against all DNS rebinding attack?

I found an example of a DNS rebinding attack scenario in the paper "Dynamic Pharming Attacks and Locked Same-origin Policies for Web Browsers". Figure 1: An example of a dynamic pharming attack ...
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Alternatives for DNS resolution

I was told it's a good idea not to use your ISP to resolve DNS, both for privacy issues and because it can be slow. So I wanted to change, but I've read criticism on using OpenDNS (who makes money on ...
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How will users know if their session is DNSSec protected or not?

There is definite security value in having DNSSec-verified connections, however I have yet to see software indicate if the connection is secure. Ultimately I would like my users to recognize that ...
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How do the root servers get updated with my name server? Is WhoIS information always in sync with the root?

I've never understood what happens behind the scenes when I go to my registrar and enter in my name server's information. Can someone elaborate on what happens when an update is made, and how it is ...
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What risk do International Domain Names (IDN) pose?

I understand that IDN's are basically a GUI display change for domains that have a prefix of "xn--". What should I advise companies do in regards to these domains? For example, should companies ...
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Is there any disadvantage in using OpenNIC for DNS resolution?

What are the advantages/disadvantages of OpenNIC vs ISP for DNS resolution with regards to security and privacy?
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DNS Spoofing vs ARP spoofing, the relationship?

As I understand, ARP spoofing can only be done on the LAN-side of the router? DNS spoofing, can that be done either side of the router? In order to do DNS spoofing, do you need to perform ARP ...
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How do I find all domains hosted on a single host?

I found several websites offer a function that allows you to list all domains hosted on the same machine, e.g you supply a.com, and it tells you b.com and c.com are both hosted on the same machine as ...
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Is DNSSEC immune to stripping signatures?

In my opinion, it should be possible to forge DNS reply so it doesn't include DS/RRSIG/... parts for any request, thus bypassing DNSSEC validation of resolved domain. Is DNSSEC system immune to this ...
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My DNS Name Server does not support DNSSec client queries, what alternatives do I have?

I am using a web browser to access DNSSec enabled sites. My current name server doesn't (won't) support DNSSec for at least a year. What are my alternatives? Do any ISPs currently offer DNSSec? ...
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Anyone use the International Domain Name (IDN) security mitigation API's? Is there a wrapper for .NET?

The International Domain Name mitigation API's are available here for download: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=ad6158d7-ddba-416a-9109-07607425a815&displaylang=en ...
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Are there DNS analysis tools that could detect bad DNS results?

Are there any tools (or at least methods that would work, if no free tools currently exist) which one could use to detect false DNS results? It would be very simply to detect an attack along the ...
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Can NSEC domain enumeration happen for zones with wildcard records?

In DNSSEC, NSEC records are used to provide proof of nonexistence. The trouble is that these records provide pointers to existent domain names (the closest known domain in either direction) ...
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Does deliberately wrong information from a DNS server violate standards generally accepted good practices?

For certain host names my DNS gives me a wrong ip address (the ip address of a transparent proxy) for which inverse DNS look up does not give me back the host I originally looked up. This is related ...
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When should a DNS entry be cached? What conditions should not be? How do I determine the TTL?

I'm writing a DNS resolver and am building a spreadsheet of when a DNS record should be cached, and not be cached... but it's harder than it first looks (to me at least). Is there consolidated test ...
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Kaminsky Bug DNS Cache Poisoning

I'm trying to use Kaminsky DNS cache poisoning method. I'm using bind9 server on ubuntu and static port. So far I achieved to insert a line into DNS cache which is ;additional www.blalba.com 80000 ...
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What's stopping DANE? [closed]

As I understand it, DANE (RFC 6698) is a promising candidate for addressing issues with current TLS Trust Anchors (i.e. Trust Anchors). My attempt at explaining the issue: Currently, CAs are ...
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Is it less secure to use OpenDNS for banking accounts, SSH, Adsense account?

I have one WiFi connection in my house which I use for my iPad, phone and computers. I want to block adult sites, time consuming sites for every device that use the WiFi connection. So I came across ...
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How to determine if resolved ip is rogue or part of CDN?

I'm subscribed to goverment's owned ISP because only this ISP provides access to rural area. It has a bad reputation because it is not only redirects sites, but also injects JavaScript for ...
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How exactly would SOPA-style DNS blocking threaten the security of the Internet?

A point that keeps getting mentioned in the SOPA debate is that the DNS blocking it prescribes will cause security problems. Can somebody explain in simple terms just exactly how SOPA threatens ...
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Why is a separate reconnaissance server needed for DNS cache poisoning?

I'm trying to understand how Metasploit's DNS BailiWicked Host Attack module works. One of the required module options is a "reconnaissance" nameserver (option RECONS). What I understand from the ...
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Unecrypted connection to server - safe?

I am using heroku and cloudflare. I am going to release my website but I don't want do it without SSL. Now I always need an heroku addon to add my SSL certificates which costs $20/month. Cloudflare ...
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Listing of DNS vulnerabilities

I am currently studying how to setup DNS servers and all aspects of the DNS system. I would also like to study the security aspect. I want to use current DNS server attack on my test servers. Is there ...
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How can I detect a VPN connection (even just in some cases) to get the real location of the user

I'm creating a web site, I would like to allow people to sign-up only from their "real" physical location (not using a VPN). I was thinking maybe comparing local and server time... what else...? I ...
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How does a client know that a DNS zone is DNSSEC protected?

Recently, I've been reading about DNSSEC and how it works. I found other questions and some very interesting answers on this and other websites related to this matter. However, I have a question to ...
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How does DNS Changer malware detection work?

This malware directs your computer to use DNS servers under control of the badguys. These DNS servers were taken over by the FBI. They were replaced with clean ones, to prevent service disruption, but ...
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Which is the best antidote for DNS cache poisoning?

I know some antidotes for DNS cache poisoning attacks, both simple as port randomisation, and more complex as DNSSEC. But, which is the more effective? Which solutions are really deployed in the ...
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I believe my Domain has been hijacked I am not receiving in sales in shopping cart

My IP address is 181.224.153.95 Domain: www.ashaybythebay.com FTP Hostname: m23.siteground.biz I added private domain servers to my domain name ashaybythebay.com and I see the two IP server ...
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captive portal wikipedia article

Something on the wikipedia page regarding captive portals have confused me: http://en.wikipedia.org/wiki/Captive_portal When a client requests a website, DNS is queried by the browser. The ...
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Blocking incoming traffic from privileged port (< 1024) to mitigate DNS DDos Amplification attacks

Hope someone can clarify. As I understand, in a DNS DDos Amplification attacks Multiple DNS queries are sent to a vulnerable name server with the source IP spoofed to that of the target server. The ...
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DDoS Protection for DNS providers

Zerigo, our DNS provider has reported to have been under heavy DDOS attack in the last 24 hours or so. Considering the distributed nature of DNS, and their architecture consisting of 5 main DNS ...
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Why isn't there a Global Root for SSL?

I was just wondering why there is a file on your computer implementing the trusted root CA's instead of something similar to DNS where there is a file on root servers that computers check against to ...
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what is the Akamai Name Server i see at some big companies

I have played with DNS a lot lately, and i have found that some big companies's web sites uses the Akamai NS as the Name Server for thier WWW servers, for example: $>nslookup > www.redhat.com ...
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Is it a real security benefit if a host uses static IP Addresses for authentication?

As my knowledge about information security is not THAT good and Google did not give me a satisfactory answer I would like to ask the community here: I am working for a company offering online ...
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How does DigitalOcean DNS verify the owner of a domain?

Say you purchase a domain on Namecheap, but want to host DNS on DigitalOcean. DigitalOcean, says to simply tell your registrar to use DO's nameservers, then set up your DNS for that domain on DO. ...
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Is DNS service secure?

I am based outside of the US, but I still want to watch Netflix. So I am thinking about signing up a DNS service such as unblocked-us, but I worry that as I am now querying an unknown ( relative to ...
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New gTLDs are coming. How will browsers handle cookies, SOP and certificates?

Given that the security "zone" varies based on the TLD, how will the new TLS be handled? For example: A browser may permit cookies to be shared and SSL certificates, and wildcard certificates ...
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How does bidirectional authentication using SSL work?

Let's say Alice wants to use a webservice on Bob. Bob is on bob.in.wonderland.com Alice opens a connections to bob.in.wonderland.com:443. Taken by DNS magic rabbit, Alice arrives on port 443 at ...
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What can and can't a malicious DNS do?

I have been thinking of using http://tunlr.net/ for accessing "geo-IP banned websites" like netflix. However, I have my concerns about safety of using some third party DNS server for everything. So, ...
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How can I tell if a DNSSec zone is protected using NSEC3 (versus NSEC)

This answer describes how DNSSec might permit "Zone walking"... where a bad guy can extract all the DNS records from a DNSSec enabled zone. NSEC3 is an update that prevents this. (See bottom of this ...
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Why don't servers vulnerable to NTP and DNS reflection attacks get blacklisted immediately?

With these reflection attacks, the source IP should be the IP of the vulnerable server. So shouldn't nodes which see abnormal amounts of NTP data be able to add the source to a blacklist and therefore ...
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Can ISPs log IP connections?

I know most, if not all, ISPs log the IPs you had tied to your network, but do ISPs keep logs of the IPs you have tried to connect to? For example, let's say I went to google.com, would the ISP be ...
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What is Open Resolver Project and how does it solve DNS reflection attacks?

What is Open Resolver Project and how does it give a solution for DNS reflection attack? I also read that Open Resolver Project follows BCP38. What is BCP38?
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Should the email address in the SOA be used to validate domain control?

I'd like to validate the ability to own a DNS domain and am already considering validation that is currently in use by others such as Email validation of Whois contacts Access to the ...
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What is a DNS leak?

I'm planning on getting a VPN service (probably Privateinternetaccess) and read that it is imperative to plug DNS leaks. The only information I found on google describing what these are is here and I ...
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DNS access limitations

Im working on a script that's going to talk to a DNS on a LAN that have information about local domains. And I believe its blocking my requests. So my question is: How can you limit a DNS server to ...