DNS is the basis of most internet applications – emails, messengers, web site browsing, etc. But we often tend to miss out the presence of this extensively used service. As a result, server administrators overlook the vulnerabilities in dns service and hackers easily exploit this aspect. (more…)
How to secure DNS server was last modified: July 6th, 2018 by Reeshma Mathews
The mood was upbeat. It was our weekly business review with a web host we support. Server improvements had resulted in zero service downtimes, and zero customer complaints on service reliability. It was time to figure out how to improve the infrastructure even further, and for that, we looked at the support requests.
Support requests give a gold mine of information on how customers are perceiving the service. Happy customers do not open trouble tickets. So, all support requests are a potential pointer to a system or process improvement. So, we started by looking at the top reasons for support tickets.
Most of us might have come across instances where mails from our domain are marked as spam even though it is legitimate. This article describes few settings that can be implemented in order to decrease the chances of mails originating from your domain being marked as spam.
Spamming can be prevented to a great extend by using anti-spamming DNS records such as SPF, DomainKey and reverse DNS.
Sender Policy Framework (SPF) records helps to prevent spoofing of mails by verifying the sender’s IP address. SPF record allows domain owners to specify IP address from which mails will originate, so that receivers verifying the SPF records can reject messages from unauthorized sources before receiving the body of the message.
A DNS cluster is a number of nameservers that share records. This allows you to physically separate your nameservers, so that in the event of, for instance, a power outage, you still have DNS functionality. This way, visitors can reach websites on your server more quickly after the web server comes back online.
In the previous blog, we discussed various DNS vulnerabilities such as Cache Poisoning, Client Flooding, Information Disclosure attacks, Vulnerability in sharing a nameserver and DDos in DNS. DNSSEC provides answers to all except DDoS attacks. DNSSEC is not the abbreviation for DNS security but a set of resource records (such as A record, MX record) which can seamlessly integrate with our existing DNS infrastructure.
DNS is for the Internet, what oxygen is for life. Though we constantly use it, we are unaware of its presence. DNS has come a long way since Stanford Research Institute’s Network Information Center (SRI-NIC) maintained a file called hosts.txt which contained host-names and their corresponding IP addresses, to a complex network of databases called name-servers.
DNS was originally designed to make it easier for us to memorize names (host-names) rather than numbers (IP addresses). Gradually, many applications and protocols used the host-names and IP addresses as a basis to authenticate the host. Thus DNS security came into being, since wrong information from a DNS server, can disallow a legitimate request from a legitimate client.
I’ve learned that there is nothing more peaceful than a sleeping child – Anonymous, Age 30
To an Internet Administrator, there is nothing more peaceful than a stable and optimized DNS server. The moment there is a wrong configuration, the server wakes up and starts crying, sites and email goes down. An important part of keeping DNS that way is properly setting up the SOA records.
What are DNS Records. DNS records or Zone files are used for mapping URLs to an IPs. Located on servers called the DNS servers, these records are typically the connection of your website with the outside world. Requests for your website are forwarded to your DNS servers and then get pointed to the WebServers that serve the website or to Email servers that handle the incoming email.
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Understanding MX records was last modified: June 22nd, 2018 by admin
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