Dns Servers

Amazon EC2 from a network administration perspective
This presents a problem because the Internet’s DNS infrastructure relies on the ability of DNS servers to cache information. The length of time that a particular DNS record is cached is called the time to live (TTL). ...

Configuring Split DNS When You Only Have 1 Server
In order for this to work you will need split-DNS. Most instructions for configuring split-DNS are complex and require 2 or more DNS servers to pull off. What if you only have a single server? Follow these steps to configure split DNS ...

DNS, Elastic IPs (EIP) and how things fit together when upgrading ...
Then we set up the DNS in our preferred outsourced DNS service and map our web site name to the IP address, eg www.rightscale.com -> 172.168.5.6. Having done that, we can launch our web server and database server. Once the web server ...

Two huge announcements from Amazon Web Services
But if you have to replace an EC2 instance handling critical traffic, you would have an outage of up to 24 hours until all the DNS servers reach the 24 hour expiration. So at Mashery, we set our TTLs to 2 minutes. ...

Is trying to fix (E)SMTP really worth it? [part 1]
There are some domains which are actually using SPF and do have valid SPF records on their DNS servers. However, those are only some of the millions of domains on the Internet. How should one treat emails coming from a domain without ...

Remote Server Administration Tools (RSAT) has been released to the ...
Active Directory Certificate Services (AD CS) Tools; Active Directory Domain Services (AD DS) Tools; Active Directory Lightweight Directory Services (AD LDS) Tools; DHCP Server Service Tools; DNS Server Service Tools ...

Set Up Dynamic DNS
The Domain Name System (DNS) maintains a constantly updated database of which names correspond to which numeric addresses. Any query to Wired.com checks first with a DNS server to find out Wired.com's IP address. ...

Website alert!
So... what might happen here is that the site might go down for some of you sometime in the next few days and it might go down for longer or shorter periods of time depending on how quickly your DNS server picks up the change. ...

Using the nslookup Command to Troubleshoot Name Resolution Issues
This command sends an inquiry to the default DNS server. If information is received, it will print the name of the server that the information is from and then print the IP address of the server you inquired about. For example: ...

HowTo: DNS from commandline in Ubuntu
I’ve been spending my day configuring an experimental Ubuntu server. That’s the reason to this sudden rush on this other pretty dead blog :D. The DNS servers your computer are using can be found in a regular text file in ...