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

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Preventing 3rd party DNS Servers from being used

While using a wireless network recently that implemented a captive gateway, I noticed that any third party DNS servers manually set would not allow the network to connect properly. This would seem ...
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134 views

What SSL certificate do I need?

I have 2 domains, one where the website is hosted (lets call it www.a.com), and another (lets call it www.b.com) which has a CNAME record pointing to the first one (www.a.com). Which one should have a ...
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252 views

How to bypass DNS spoofing protection

I know that SSL certificates prevent DNS spoofing, but I was wondering why it is not possible after ARP cache poisoning to set up iptables rules and redirect the origin destination to fake page?
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122 views

TLS domain name mismatch

Suppose I want to talk to example.com over TLS the and server I am redirected to is foo.com. But during the handshake it can prove it holds the private key that matches example.com certificate. Why ...
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2answers
367 views

Difference between DNS spoofing and phishing [closed]

I am writing a bachelor thesis and I am having a hard time figuring out the difference between phishing and DNS spoofing. From what I understand, DNS spoofing is a way to achieve a succesfull phishing ...
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140 views

Force DNS to attach bad IP address

The question is not professional, but what I'm trying to say is... Is there any way to inject or force the DNS server to attach/change an IP address for some site. For example, I'm running an apache ...
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99 views

DNS Redelegation - Security Risk?

I am a web developer and I use Adobe Business Catalyst. To use some of their services it is recommended you redelegate the domain. In other words change the nameservers to Business Catalyst. I have ...
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431 views

Assuming no MITM, is Gmail communication 100% secure and private?

I sometimes have to use my personal Gmail account from my company workstation, where I know for fact they are using content-aware firewall(s) like Palo Alto, and potentially other nasty things like ...
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282 views

How does http://un****-us.com/ work?

There is this site un**-us.com which supposedly allows you to bypass ISP rules such as content restriction on a particular area. Now , it is well known that routing your traffic through a web proxy ...
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5k views

What are the risks of removing ISATAP from the default global block list?

The process of installing Microsofts pseudo VPN called Direct Access requires me to remove the ISATAP name from the default global block list by running this command: dnscmd /config ...
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43 views

Strange apple dns answers

Could someone please explain to the results of a reverse DNS lookup I ran? dig -x 17.178.96.59 I was expecting apple.com but it also listed a whole load of PTR's. Many looked like phishing sites like ...
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85 views

How do web hosts know you own your domain?

Let's say I registered a domain on Namecheap and want DigitalOcean to be my host. This can be achieved by first setting the nameservers to DigitalOcean in Namecheap's backend: Second, we add some ...
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36 views

Does DNSCrypt mask/hide the URLs I visit

I use DNSCrypt (https://dnscrypt.org/) and I'd like to know whether it's useful to mask/hide from my ISP (Telecom) the HTTP requests I make in my browser. And how does it protect me? Thanks
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114 views

Does using FreeDNS introduce a security risk?

If you use a service like FreeDNS for a DNS, does this introduce any additional security risk as opposed to simply paying a registrar? Obviously the owner of FreeDNS could hijack your domain. But ...
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64 views

Could my DNS requests get manipulated while using tor?

I just downloaded Tor Browser Bundle and extracted it. I had no copy of my Tor Nodes Settings so i just browsed using the standard nodes and i forgot to disabke Java Script. I did not notice ...
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157 views

Using DNS to track browser activity on a LAN

I am trying to create a small network auditing script that tracks HTTP and HTTPS domain names visited by certain hosts using the libpcap wrapper for Nodejs. At its best the script would be able to ...
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198 views

DNS queries to compromise DNS cache

The transaction ID for DNS queries can take values from 1 to 65,536 and my computer pseudorandomly chooses one for each DNS request. If I sents 1,024 false replies per request, how many requests ...
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209 views

Network enumeration protection [closed]

I was reading about DNS security, and readed about Zone Transfer and how can be used to retrieve host information of a network, so not allowing Zone Tranfer from external sources will be the solution ...
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6k views

Anyone out there using Umbrella from OpenDNS? What exactly is it?

I'm still looking for a centrally-managed AV/malware management system and I've been testing out both Panda and Webroot (due to their 'cloud-based' structure that doesn't require a server for me to ...
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1answer
32 views

How are DNS requests sent when using ovenvpn? Are they encrypted?

I use openvpn in thru the gnome network manager. When my computer is connected to the vpn do DNS requests look like they come from the vpn exit ip or from my real ip? Are the DNS requests sent in the ...
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1answer
38 views

Network Scans Find Absent Device

Using Nessus (an uncredentialed full scan) and Nmap (essentially a full port scan), I am finding a phantom device. This device is supposed to be a well-out-of-commission device, but is returning a ...
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1answer
56 views

Can you force your PC or device to use only DNSSec-verified lookup results?

Okay, I'll admit something first-off: I don't really understand some of the practical aspects of how DNSSec protections work very well.(Even after reading resources like this.) Well, I certainly ...
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29 views

What are the real risks of enabling unsecure DNS updates on Active Directory intranet domain?

Based on my current research, enabling the unsecure DNS updates is a requirement for enabling DHCP Linux clients from registering their names with a FQDN. While this works fine for Windows machines ...
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124 views

Using dnscrypt on a public hotspot with a captive portal

What strategy shall I take if I wanted to use a dnscrypt with a public hotspot that requires login through a captive portal? Such hotspots require DNS settings to point to their servers (via DHCP) so ...
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336 views

Is DNS secure when using DNS crypt?

Is it the same security level like a VPN DNS wise when using Open DNS crypt servers plus DNS crypt proxy? I installed both packages in Ubuntu and now unless I have the right IP entry in the network ...
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179 views

Using free subdomains to circumvent web filtering systems

(I was told that this was the place to ask this by someone from Webmasters, if I've got it wrong again please give me a chance!) I'm running a personal proxy service for the use of myself and some of ...
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369 views

Root/Naked domain and DDOS

Some services like Github has DDOS mitigation measures for their root/naked domain, but not other subdomain(s). What so special about the root domain concerning the DDOS attacks? [1] ...
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284 views

DNS zone size overload?

Is it possible to DOS DNS by creating custom dns zones with lots of text records in them so that the size of the DNS zone is in the order for example 100 Gigabyes, and then query all the dns records ...
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594 views

Proxy aware or DNS capable meterpreter?

I'm having issues traversing a proxy protected network and was wondering if there are meterpreter implementations which allow proxy awareness (automatically using windows AD credentials) or which can ...
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475 views

Following redirects from HTTPS to HTTP - Secure?

So I have an HTTP client which supports HTTPS. However, it doesn't follow the HTTP spec recommendation for redirects on POST(which is to ask the user before redirecting) This means, in theory, if you ...
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4k views

Is it safe to use namebench?

As the title states is Google's namebench utility safe to run on my Mac and let it use Safari's web history?
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734 views

Should Windows 2008 R2 be used as an externally facing DNS name server?

When compared to more traditional DNS name servers, what are the benefits / drawbacks of using a Windows 2008 R2 as a public ns record for a company. What limitations, or security issues would I ...
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76 views

UDP DNS & Firewall

This question might be simple but please understand my lack of knowledge. I am seeing a lot of DNS packets dropped by our firewall (sophos SG125) by default rule 60001. There are three Domain ...
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60 views

Using a Firewall to Trigger Truncation in DNS UDP Response

Assume I am a firewall between client and server. If the client sends a DNS query with UDP, I should response this query with set the truncated flag=1. As a result, the client will be forced to use ...
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241 views

What are the pros and cons of using DNS to block unwanted domains?

There are many methods to block unwanted outgoing requests. Examples include browser settings and extensions, and .hosts files. While DNS blocking won't affect direct accesses to a numeric IP address, ...
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87 views

How Fast Flux technique works exactly?

I was reading about botnets and C&C servers and saw this term. I've read this Wikipedia article but I couldn't really understand what and how this is working. I think its some kind of proxy ...
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316 views

Is it possible to redirect someone to a fake site without changing the hosts file?

Is it possible to redirect someone to a fake site without changing the hosts file? When I access a bank site, I receive a fake page. But my hosts file does not have any changes to do this. Is it ...
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512 views

Security risk with using internal IP on public DNS

A web server inside the office network which is accessed by staff internally and the internal DNS resolves web.company.com to the server's LAN IP. Publicly, company.com nameservers belong to their ...
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1k views

DNS settings compromised from WAN on Edimax ADSL router

My home network Edimax AR-7084gB ADSL modem/router with firmware verison 2.9.5.0(RUE0.C2A)3.5.18.0 was exploited from WAN few days ago. The attacker changed DNS server settings - primary server to ...
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772 views

DNS causing SSL errors

On my old ISP's DNS servers, sometimes https://www.facebook.com would return a cert for Akamai instead of Facebook. What I don't understand is that changing my DNS server to Googles (8.8.8.8) fixes ...
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490 views

Manual DNS change

If I manually change my DNS setting in the router or in Windows settings from the provider's one to, say, 8.8.4.4 by Google - will it mean that my ISP has no idea which sites I am going to? Maybe it ...
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489 views

DNS query through squid? [closed]

My IDS picked up our squid proxy server doing a dynamic DNS request. I wasn't aware squid passed DNS requests from the client to the internal DNS server. Is this possible? Snort Alert: ET POLICY ...
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163 views

Reliability of DNSBLs for Stopping Forum Spam

I know that certain DNS blacklists are considered more reliable than others, in that they don't have as many false positives. I run a forum that is known to be spammed, and I've installed a mod to ...
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Why do browsers or operating systems not have default DNSSEC validation?

Many resolvers (including TLDs and Root TLDs) support DNSSEC, also Google's OpenDNS servers support it. Yet it isn't checked on the client side by default, why is this?
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Standard for securing web server to client connections via HTTPS on the local area network

I am trying to set up some kind of secure client to web server connection that takes place entirely on local area networks, but I'm having trouble understanding what the recommended best practice is. ...
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Are name server's data public, and how to retrieve them if they are? [migrated]

Knowing the IP of a name server, is it possible to retrieve the "associations" that this server does between numerical IPs and domain names? For example, a name server who would manage the domain ...
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41 views

Secure DHCP, DNS, Active Directory Server

Are there any common vulnerabilities when creating a DHCP,DNS, and Active Directory server that should be addressed immediately? The operating System is Windows Server 2012 R2 64-bit.
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110 views

Why did I get a wrong IP and certificate for www.facebook.com just now? [closed]

I just navigated to www.facebook.com and my browser alerted me that an invalid certificate has been received. I checked the cert in question, and I was surprised to see that the Common Name on it was ...
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In using a VPN service is it possible to transmit data without giving away system configuration details?

In using a VPN service I want to feel comfortable in the knowledge that outsiders cant simply build up metadata on my browsing activities. The fact it is done is somewhat unsettling. I have spent days ...
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106 views

AirVPN, DNS Leaks on Windows 8.1, but not Ubuntu

I've noticed when I visit dnsleaktest.com using Windows 8.1 & Chrome a bunch of UK IP addresses (Belonging to my ISP) are displayed alongside the Netherlands IP address I should be appearing as ...