Managed dns webinar 2015 internap

DNS: An Overlooked Source of LatencyMarch 26, 2015

Meet the Presenters

2

Drew McBath

InternapSenior Director,

Product & Strategic Marketing

Ben Whitaker

Internap

Sr. Software Architect

#INAPDNS

Goals

3

1. Understand what DNS is and how it works.2. Cover the factors that affect webpage load times.3. Identify important DNS features and their functions.4. Learn some ways DNS can impact your business.5. Segment the different types of DNS solutions available.6. Become a more informed buyer!

#INAPDNS

What is DNS?

4

DNS (Domain Name

System) maintains a catalog

of domain names, such as

“internap.com”, and resolves

them into IP addresses.

Therefore anyone that has a

presence online uses DNS.

In other words, DNS is

needed for any user to find

and connect to any website.

INTERNAP.COM

243.64.13.101

#INAPDNS

How does DNS work?

5

Top Level DNS

Server

Local DNS

Resolver

Internap.com

Authoritative Name

Server

I want to go to

www.internap.com

Not in my

cache

#INAPDNS

http://www.internap.com/

How does DNS work?

6

Top Level DNS

Server

Local DNS

Resolver

Internap.com

Authoritative Name

Server

Authoritative Name Server

for internap.com is at

243.64.13.8

#INAPDNS

How does DNS work?

7

Top Level DNS

Server

Local DNS

Resolver

Internap.com

Authoritative Name

Server

www.internap.com is at

243.64.13.101

#INAPDNS


How does DNS work?

8

Top Level DNS

Server

Local DNS

Resolver

Internap.com

Authoritative Name

Server


243.64.13.101

#INAPDNS


How does DNS work?

9

Top Level DNS

Server

Local DNS

Resolver

Internap.com

Authoritative Name

Server


243.64.13.101

243.64.13.101

#INAPDNS


Important factors that impact page load times:

• Initial connections

• DNS lookups

• SSL handshakes

• Waiting to receive data from server

• Receiving/sending data to/from the server

DNS lookups are critical because they can make up a

large percentage of page load times.

What affects website load times?

10 #INAPDNS


11

Tested at http://tools.pingdom.com/fpt/

Category % of Load time Actual Time (s)

Wait 34.16% 0.953

Receive 32.30% 0.901

DNS 16.56% 0.462

Connect 16.98% 0.474

SSL 0% 0.000

Send 0% 0.000

www.uga.edu

Total load time: 2.79s

www.uga.edu Waterfall View

#INAPDNS

http://www.engagdet.com/

http://www.uga.edu/


12

www.engagdet.com Waterfall View

Tested at http://tools.pingdom.com/fpt/

Category % of Load time Actual Time (s)

Wait 52.76% 1.894

Receive 10.06% 0.361

DNS 17.34% 0.623

Connect 16.93% 0.608

SSL 2.86% 0.103

Send 0.05% 0.002

www.engadget.com

Total load time: 3.59s

#INAPDNS



Managed DNS Features - Anycast

13

DNS

Server

DNS

Server

I want to go to

www.internap.comDNS

Server

DNS

Server

#INAPDNS

Internap.com



14

DNS

Server

DNS

Server

I want to go to

www.internap.comDNS

Server

Closest

name server*

DNS

Server

www.internap.com

is at 243.64.13.101

*Based on AS path length

#INAPDNS

Internap.com




15

DNS

Server

DNS

Server

I want to go to

www.internap.comDNS

Server

Closest

name server*

DNS

Server

www.internap.com

is at 243.64.13.101

*Based on AS path length

#INAPDNS

Internap.com

243.64.13.101



Managed DNS Features – Active Failover

16

DNS

Server

Internap.com (primary)I want to go to

www.internap.com


243.64.13.101

Internap.com (secondary)

Health monitoring

243.64.13.101

#INAPDNS




17

DNS

Server

Internap.com (primary)


243.64.13.101


243.64.13.101

!

Health monitoring

#INAPDNS



18

DNS

Server

Internap.com (primary)


Health monitoring


106.19.26.102

#INAPDNS


Scenario:A growing e-commerce site has been handling their DNS needs through their ISP since

inception. Recently they expanded to the EU and noticed that users were experiencing

unacceptable latency while connecting to their site. Furthermore, last month, users were

unable to reach the ecommerce site for up to 10 minutes.

Impact:Lost Revenue

Customer Frustration

Causes:DNS name servers not geographically close to a large percentage of users.

Routing table errors were misdirecting requests to far afield name servers.

Network congestion contributed to slow resolution of DNS queries.

A hardware failure occurred at one of the name server nodes – no DNS failover.

How DNS can impact your business

19

Increased Churn

Decreased Loyalty

Increased Acquisition Costs

#INAPDNS

Business Impacts

20

Average Delay in Websites when Business Performance Starts to decline:

Trac Research: http://www.slideshare.net/KenGodskind/alertsitetrac

Compuware/Gomez Annual Survey: Why Web Performance Matters

Aberdeen Group report, “The Performance of Web Applications: Customers are Won or Lost in One Second.”

4.4 seconds

Impact on conversion rate for every additional second of website load delay

-7%

Proportion online shoppers that said they’d leave for a competitor’s site

rather than suffer delays:

75%

#INAPDNS

http://www.slideshare.net/KenGodskind/alertsitetrac

Shoppers per month 85,000

Typical Conversion Rate 2.00%

Shoppers Buying Item per month 1,700

Typical Cart Size 42$

Average Revenue per Month 71,400$


Slow-site Conversion Rate 1.86%


Slow-site Cart Size 40.74$


Lost Revenue per Month 14,568$

Lost Revenue per Day 478$

Lost Revenue per Minute 0.33$

Business Impacts

21

Downtime Unacceptable Lag

7% conversion

rate reduction

3% cart size

reduction

(DNS servers completely

unavailable)

(5.4 seconds or

+1 second of incremental delay)


Typical Conversion Rate 2.00%


Typical Cart Size 42$


Average Revenue per Day 2,341$

Average Revenue per Minute 1.63$

Lost Revenue per Minute 1.63$

#INAPDNS

What DNS solution is right for you?

22

Manage every aspect of DNS, from

operations to infrastructure.

DIY Home-grown DNS

Control

Complexity

×Cost

?

Vulnerability

Performance

×

×

Support ?

Feature Set ?

#INAPDNS


23



Bundled ISP/Hoster DNS

ISP or Hoster bundles DNS with

bandwidth commit or purchase of

servers.

DIY Home-grown DNS

Control

Complexity

Cost

Vulnerability

Performance

?

?

×

×

Support ?

Feature Set ?

Control

Complexity

×Cost

?

Vulnerability

Performance

×

×

Support ?

Feature Set ?

#INAPDNS


24

Managed DNS

Control

Third party manage every aspect of

DNS, from operations to

infrastructure.

Complexity

Cost ?

Vulnerability

Performance

Support

Feature Set



Bundled ISP/Hoster DNS

Control

ISP or Hoster bundles DNS with

bandwidth commit or purchase of

servers.

Complexity

Cost

Vulnerability

Performance

?

?

×

×

DIY Home-grown DNS

Support ?

Feature Set ?

Control

Complexity

×Cost

?

Vulnerability

Performance

×

×

Support ?

Feature Set ?

#INAPDNS

Key Takeaways

25

• Don’t neglect your DNS service. This results in loss of

traffic, revenue and happy users.

• A robust Managed DNS solution provides the features,

reliability, reach and performance needed to support

todays websites and applications in addition to solving

the drawbacks of an in-house or ISP DNS solution.

• DNS can be a disaster recovery solution by using failover

to ensure your users can always find you.

#INAPDNS

Internap’s Managed DNS

26

Internap’s Managed DNS uses anycast routing across 24 POPs (points of presence)

worldwide to quickly send requests to the closest name server and leverages our

MIRO-enabled network to minimize latency and improve consistency. Our intuitive web

interface and customizable API provide the control and flexibility you need to quickly

get your websites up and running.

DNS POP Metros

Atlanta New York (2)

Boston Philadelphia

Chicago (2) Phoenix

Dallas San Francisco

Denver Seattle

Frankfurt Singapore

Hong Kong Sydney

Houston Tokyo

Irvine Toronto

London Washington D.C.

Los Angeles

Miami

Internet users and Internap Managed DNS POP locations

#INAPDNS

Further Reading

27

• Where do I learn more about DNS?http://www.techsupportalert.com/content/what-dns-servers-do.htm

• Is DNS important?http://www.techrepublic.com/blog/data-center/dns-painful-reminders-of-how-important-it-is/

• How do I measure my own site’s DNS performance? http://tools.pingdom.com/fpt/

• How can DNS can help during outages?http://www.sans.org/reading-room/whitepapers/recovery/touch-disaster-recovery-solution-continuity-

operations-33373

• Internap Managed DNS webpage and datasheet: http://www.internap.com/network-services/ip-services/managed-dns/

#INAPDNS

http://www.techsupportalert.com/content/what-dns-servers-do.htm

http://www.techrepublic.com/blog/data-center/dns-painful-reminders-of-how-important-it-is/

http://tools.pingdom.com/fpt/

http://www.sans.org/reading-room/whitepapers/recovery/touch-disaster-recovery-solution-continuity-operations-33373

http://www.internap.com/network-services/ip-services/managed-dns/

28

Q&A

#INAPDNS

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