Feature Comparison - IP Anycast

	DNS Made Easy	Dynect	Netriplex	UltraDNS	Route 53	easyDNS
DNS Features
DNS Failover
Round-Robin
Geo/Directional DNS
Weighted Load Balancing
DNSSEC
Vanity DNS
Login and Security
Multiple Users
ACL Logins
Captcha Logins

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Overview of Features

System Monitoring and DNS Failover

System Monitoring is a feature where the DNS provider will monitor your web server IP to ensure that it is available. Failover is when the DNS provider is then able to automatically switch your A record to use a secondary/backup IP address if your primary IP address is down. This feature requires that you run at least one backup/secondary web server which either mirrors the primary, or acts as a disaster recovery site.

Round Robin

Round Robin load balancing allows you to create multiple A records using the same host name but different IP addresses. This way, queries for your record will be evenly split between the different addresses. So if you had two IPs, each would receive 50% of your traffic. With four IPs, each would receive 25%, etc.

Geo/Directional DNS

Global Load Balancing, also known as Geo-DNS, allows you to direct queries to the webserver closest to the client. So if you have servers located in the US and Europe, your European customers will automatically be sent to the server in Europe, whereas American customers will be sent to the server in the US.
This feature requires that you maintain identical web servers in each of the locations you wish to direct queries to. Because of the routing procedures used in DNS, the accuracy of this feature is not yet at 100%.

Weighted Load Balancing

Weighted load balancing works like Round Robin load balancing, where you can have multiple A records for the same host name, using different IP addresses. This method of load balancing allows you to specify how much traffic you want each IP to receive.

DNSSEC

DNSSEC is a suite of security measures, intended to provide resolvers with the origin authentication of DNS data, data integrity, and authenticated denial of existance. Deployment of DNSSEC specifically has been hampered by the difficulty of devising a backward-compatible standard that can scale to the size of the internet, deploying DNSSEC across all resolvers, disagreement over who should own the TLD root keys, and overcoming the complexity of DNSSEC deployment.

Vanity DNS

Vanity DNS allows you to rename your provider's name servers to look like your own. You do this by creating A records within your domain that point to your name servers' IP addresses, thus giving the illusion that your company owns them.