1. UDgateway WAN Optimization

2. www.UDcast.com - UDgateway overview
1. Why UDgateway?
All-in-one solution
Value added services
Networking project requirements
Optimize IP traffic on constrained links
Enhance user experience
Save bandwidth
UDgateway is a comprehensive solution for two main purposes:
Enable Service Providers to address specific network requirements and therefore add value to their offerings
Improve the network performance on links with suffer from technical or financial constraints, such as:
Low bit rates
Long latencies
Expensive bandwidth
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- UDgateway overview 2 2

3. www.UDcast.com - UDgateway overview
What’s in a UDgateway?
Link
management
Web
compression
Content
distribution … …
Compression
Quality of Service
Security
Acceleration
The “add-on” features are available on some Udgateway models.
They are enablers for value-added services.
The lower features are available on all Udgateway models.
They are enablers for WAN optimization.
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4. www.UDcast.com - UDgateway overview
WAN optimization
Acceleration
Security
WAN optimization
Quality of Service
Compression
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5. Performance enhancement
File sharing acceleration
Transfer times with UDgateway
Download time (Seg)
Time (s)
without UDgateway
with UDgateway
ADSL
Unacceptable
50%
6.3x
4.7x
7.4x
These graphs show the effects of the WAN optimization features the user experience:
Web browsing times are reduced
Download times are reduced
 End-user satisfaction improvement
8.6x
1/3 OK
25.8x
24.5x
19.9x
19.3x
Good
20%
40%
60%
80%
Site %
FTP
HTTP
CIFS
POP3
Source: UDcast, January 2009
Tests done on dedicated 1Mbps/1Mbps Data Rate, Delay 600 ms and word files (3.4 MB)‏
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6. Performance enhancement
File sharing acceleration
Transfer times with UDgateway
Download time (Seg)
Time (s)
without UDgateway
with UDgateway
ADSL
Unacceptable
50%
6.3x
4.7x
7.4x
These graphs show the effects of the WAN optimization features the user experience:
Web browsing times are reduced
Download times are reduced
 End-user satisfaction improvement
8.6x
1/3 OK
25.8x
24.5x
19.9x
19.3x
Good
20%
40%
60%
80%
Site %
FTP
HTTP
CIFS
POP3
Source: UDcast, January 2009
Tests done on dedicated 1Mbps/1Mbps Data Rate, Delay 600 ms and word files (3.4 MB)‏
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7. www.UDcast.com - UDgateway overview
WAN optimization
Acceleration
Improve end-user experience
Use bandwidth efficiently and effectively
Security
Control network access
Block unwanted traffic
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8. WAN optimization (cont.)
QoS
Control bandwidth usage
Ensure fair bandwidth sharing
Prioritize business critical traffic
Compression
Use bandwidth efficiently and effectively
Eliminate redundant traffic
Get extra bandwidth for free
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9. File download compression
Download time reduction: up to -97%
3 seconds instead of 1min40s
Volume reduction: up to -97%
3 MB instead of 100 MB
Bandwidth efficiency: up to x24
24 Mbit/s for the price of 1 Mbit/s
WAN optimization is particularly spectacular for large file downloads.
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10. www.UDcast.com - UDgateway overview
Link Management
Benefit from multiple WAN links
High-availability
Least Cost Routing
Adapt routing strategy to
Applications
Users
More links means more bandwidth
Differentiate forward / return links
Multi-ISP links
Link Management is a key feature for subscribers with multiple links, for example: VSAT + Inmarsat. Often, these links have very different characteristics, both in technical terms (throughput, latency, security) and in financial terms (volume-based cost, flat fee for shared bandwidth or dedicated bandwidth)
Link Management is a flexible feature that enables optimal use of each link.
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11. www.UDcast.com - UDgateway WAN optimization
DNS proxy
Purpose
Cache DNS responses locally
Deliver responses at LAN speed
References
RFC Domain names - concepts and facilities
RFC Domain names - implementation and specification
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12. At least 600 ms saved for same request
DNS proxy
ISP
At least 600 ms saved for same request
DNS
2) DNS request:
Where is ?
3) DNS reply:
DNS
IDU
DNS
4) DNS reply:
1) DNS request:
Where is ?
INTERNET
5) IP request
WEB
6) IP reply
ping
( )
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13. www.UDcast.com - UDgateway WAN optimization
4. WANcompress
Purpose: Save bandwidth by eliminating redundancy from network streams
Example:
Send with large attachment
Make some changes
Send again
 Only the changes are sent
More than 20x acceleration on repetition of same data
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14. WANcompress Compression (I)
File Transfer – first time
Full file transferred
On the fly compression
UDgateway-WANcompress®
UDgateway-WANcompress®
WAN
File saved to disk
on both ends
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15. WANcompress Compression (II)
File Transfer – second time
Full file transferred
Only label reference
WAN
UDgateway-WANcompress®
UDgateway-WANcompress®
Synchronized
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16. WANcompress Compression (III)
Edited file transfer
Full file transferred
Label + Modifications
Changes +
UDgateway-WANcompress®
UDgateway-WANcompress®
Synchronized
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17. Benefits for Service providers
Get more out of expensive links:
Satellite, WiMAX, Microwave, etc.
Put more customers on same infrastructure
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- UDgateway WAN optimization

18. Benefits for end-users
Get more out of slow or expensive links
GPRS/UMTS, Inmarsat, VSAT, WiMAX, etc.
Avoid upgrading link
Reduce volume-based charges
Avoid Fair Access Policy penalty
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19. WANcompress operation
TCP stream level
Independent of file structure
WANcompress does not even know what a “file” is
Independent of delivery method
Mail attachment, ftp, web download
Unencrypted traffic
Before VPN encryption
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20. WANcompress operation (cont.)
Traffic redundancy
Data protocol headers
Non-cacheable Web objects
“nocache” tag, scripts, dynamic pages (PHP, JSP, ASP…)
Collaborative workplace
Software updates
Antivirus
Windows, Adobe, Firefox, Apple…
“The bigger, the better”
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21. WANcompress operation (cont.)
Dictionary-based compression:
Compression dictionary
Transmitted streams  labels
Decompression dictionary
Received streams  labels
Transparent to both communicating parties
Fully interoperable with all TCP applications
Lossless compression
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22. www.UDcast.com - UDgateway WAN optimization
WANcompress vs. IPcomp
Compression scope
IPcomp
Only fractions of seconds in traffic history
8 KB block default
1.5 KB in practice
WANcompress
Up to days or weeks of traffic history
On-disk dictionary : tens of Gigabytes
10 Gigabytes  10 days of traffic at 100 kbit/s average
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23. www.UDcast.com - UDgateway WAN optimization
WANcompress security
TCP streams are stored on source and destination  confidentiality
Data streams may be encrypted on disk
Only UDgateway that has stored it can decrypt it
Decryption key is destroyed by power-off
Exists only in RAM
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24. WANcompress reliability
Data on source and destination disks out of sync  data integrity
Checksums
When in doubt, uncompressed data is sent
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- UDgateway WAN optimization

25. Resetting the dictionaries
Reboot
Disable / wait for 10 seconds / enable
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26. Thank you for your attention
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- UDgateway WAN optimization