Tags: dns

DNS Security Still an Issue

DNS security is a decades-old issue that shows no signs of being fully resolved. Here's a quick overview of some of the problems with proposed solutions and the best way to move forward. ...After many years of availability, DNSSEC has yet to attain significant adoption, even though any security...
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ICANN Sets Plan to Reinforce Internet DNS Security

Internet Corporation for Assigned Names and Numbers (ICANN) has voted to go ahead with the first-ever changing of the cryptographic key that helps protect the internet’s address book – the Domain Name System (DNS).  The ICANN Board at its meeting in Belgium this week, decided to proceed with its...
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Anatomy of a Linux DNS Lookup – Part I

Since I work a lot with clustered VMs, I’ve ended up spending a lot of time trying to figure out how DNS lookups work. I applied ‘fixes’ to my problems from StackOverflow without really understanding why they work (or don’t work) for some time. Eventually I got fed up with this and decided to...
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3 Useful Things You Can Do with the IP Tool in Linux

It has been more than a decade since the ifconfig command has been deprecated on Linux in favor of the iproute2 project, which contains the magical tool ip. Many online tutorial resources still refer to old command-line tools like ifconfig, route, and netstat. The goal of this tutorial is to share...
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Achieve Resilient Cloud Applications Through Managed DNS

As the pace and complexity of application development and delivery have increased, the role of DNS has changed considerably. Originally, DNS was a simple on-premises location service for matching IP addresses to correct hostnames. As applications have moved from local data centers to the public...
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Suspicious Event Hijacks Amazon Traffic for 2 Hours, Steals Cryptocurrency

Amazon lost control of a small number of its cloud services IP addresses for two hours on Tuesday morning when hackers exploited a known Internet-protocol weakness that let them to redirect traffic to rogue destinations. By subverting Amazon's domain-resolution service, the attackers masqueraded as...
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Tips for Troubleshooting DNS

Need relief for your DNS headaches? First, it helps to understand how the domain name system works under the hood. DNS is the Internet's phonebook. Whenever you type in or click a human-readable web link (such as hpe.com), your web browser calls on a domain name system (DNS) resolver to resolve...
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DNS Resolvers Performance Compared: CloudFlare x Google x Quad9 x OpenDNS

A couple of months ago I did a performance comparison between some of the top free DNS Resolvers available. It was just after Quad9 had launched and I was trying to decide which one to use and recommend to families and friends. Google, OpenDNS, Quad9, .. some many options… I love options … And...
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round robin
DNS round-robin is mapping multiple servers to the same hostname and really has nothing to do with the charming variety shown here.

Simple Load Balancing with DNS on Linux

When you have server back ends built of multiple servers, such as clustered or mirrowed web or file servers, a load balancer provides a single point of entry. Large busy shops spend big money on high-end load balancers that perform a wide range of tasks: proxy, caching, health checks, SSL...
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dnsmasq
Learn how to configure DNS and DHCP, using Dnsmasq in this networking tutorial.

DNS and DHCP with Dnsmasq

Last week, we learned a batch of tips and tricks for Dnsmasq. Today, we're going more in-depth into configuring DNS and DHCP, including entering DHCP hostnames automatically into DNS, and assigning static IP addresses from DHCP. You will edit three configuration files on your Dnsmasq server: /etc/...
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