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Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Registering a reverse DNS in Azure is complicated by the fact that you need to have a forward A record pointing into an IP address before you can register the reverse. That means that if you are creating via template, you need to pre-configure a forward domain else the template will fail. So presuming you are using a template there are a few steps you need to perform beforehand.
Create an Azure static address - this needs to be static since we're not going to allocate it to a machine. The process of creating a Public IP Address with fully qualified Reverse DNS lookup (ReverseFqdn) is wonky.
From here, creating a virtual machine that is assigned your public (static) IP with Reverse Lookup capabilities is just a matter of associating the VM with the IP you just created. While I appreciate the help, there was WAY too much detail lacking to be helpful to someone who is brand new and struggling to understand this complex process. Not the answer you're looking for?Browse other questions tagged azure reverse-dns or ask your own question.
2)Resource Records and the Zone file -A Zone file is basically a text file present on the server hosting the domain that contains entries for different resource records. MX Records-This basically tells us which server is responsible for receiving mails sent to that domain name. I will take this moment to introduce DIG which is a handy little tool, we can also do the same queries using DIG. WildCard – A wildcard entry is used to provide responses for subdomains that do not exist. 5)DNS Zone Transfer-We saw in the previous exercises that every domain has some authoritative name servers associated with it. To protect your nameservers from leaking valuable information, one must allow zone transfer to other nameservers of the same domain only. DNS protocol is a very critical component of the Internet as it resolves IP-address into hostnames and makes life a lot easier for us. Prateek Gianchandani, a recent IIT graduate, has interests in the field of Penetration Testing, Web Application Security and Intrusion Detection. Indeed it is, it’s funny that even most of the hosting service providers do not recognize that, leaving their NS to allow zone transfer from any client !
How can i have access to the internet if collage server has locked all websites,and any time you try to visit any site its bringing the isp page?
InfoSec institute respects your privacy and will never use your personal information for anything other than to notify you of your requested course pricing. Practice for certification success with the Skillset library of over 100,000 practice test questions. This means that we are querying for the A records which will return us an IP-address in return for the domain we query. This basically means that our DNS server queried an external DNS server to fetch the IP-address.

Each line is represented by a different record .In some cases these records may exceed one line and hence must be enclosed within a parantheses. The general way of writing a resource record is writing the domain name, record class, record type, and then some additional information. I type in the domain name as the second command and get the corresponding IP-address for it. Note that querying from your own dns server may not give you the accurate information every time. We will do this by traversing the entire DNS hierarchy from the root servers to the top level domain.
Notice the dot (.) at the end, this is what makes this a fully qualified domain name (FQDN). However, if the nameservers are not properly configured they might leak out the whole DNS server database to any malicious hacker. I would like to hear real world stories on how improperly configured DNS servers brought down the whole network. We have been training Information Security and IT Professionals since 1998 with a diverse lineup of relevant training courses. However some security vulnerabilities exist due to misconfigured DNS nameservers that can lead to information disclosure about the domain.
This process may take place through a local cache or through a zone file that is present on the server. It is now the responsibility of the DNS resolver in the user’s operating system to fetch the IP address.
Each zone file must start with a Start of Authority (SOA) record containing an authoritative nameserver for the domain (for e.g.
Note that finding the nameservers can give us some information about the hosting provider of the domain.
We have a wordlist in which we contain the subdomain names we want to test the domain against. Since one of the nameservers is not properly configured, it allows zone transfer and what we see is a dump of all the information (records,subdomains etc).
Most of the DNS servers are properly configured and do not allow zone transfers to every client. Fierce is a very handy tool for DNS Analysis and it is something everyone should have in their armory. Even if the servers are properly configured, they can be brute forced to leak information about their mail servers, IP addresses, etc.
In the past 16 years, over 50,000 individuals have trusted InfoSec Institute for their professional development needs! I've looked around a lot online, and while I've found some (2+ year) old questions about it, I can't find any answers.
This forms an important step of the Information Gathering stage during a Penetration test or Vulnerability assessment. A zone file is a file on the server that contains entries for different Resource Records (RR).

It first checks it’s local cache to see if it can find a record for the queried domain name.
Then we do a ping of all these subdomains, if these domains resolve to an IP-address different than the host IP-address, then we can very surely say that this subdomain actually exists. Usually a big organization will have more than one nameservers so that if one goes down for some time, the other one is ready to back it up and handle the requests.
Fierce will first check if Zone transfers are allowed or not, if zone transfers are allowed, it will dump all the information and exit happily, otherwise it will brute force it. It is therefore important to properly configure your DNS servers and be aware of the security issues with DNS. A cache usually contains a mapping of IP-addresses to hostnames which are saved during recent lookups so that the resolver does not have to fetch the IP address again and again.
They use multiple servers to serve the request as one server is generally not capable of handling all the requests. However before performing a brute force it would be better to actually check if Wildcard entries are enabled or not. Usually one of these servers will be the Master server and the other one will be the slave server. We need to supply Fierce with a wordlist containing a list of all the possible subdomain names (for e.g. In the information gathering stage of a penetration test of a website, it is important to identify the subdomains and the IP-addresses corresponding to them.
Hence to stay in sync with each other, the slave server must query the Master server and fetch the latest records after a specific period of time.
Hence this kind of information increases our attack vector by a fair amount, an amount which cannot be ignored. As soon as it finds the IP-address it returns the IP-address back to the user and also caches it for it’s future use.
If this is the case for some random subdomains, then we can clearly say that Wildcard entries are enabled for this domain. A properly configured nameserver should only be allowed to serve requests of Zone transfer from other Nameservers of the same domain.
However if the server is not configured properly it will serve all requests of Zone transfer made to it without checking the querying client.
If it resolves to a different IP-address then we are sure that this subdomain actually exists.
If wildcard entries are not set , we do the same thing and see if we get response from any subdomain we query.

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