UDgateway Service Platform WAN Optimization


UDgateway® is the WAN optimization software running on the Central Site Service Platform (CSP) and Remote Service Platform (RSP).
UDgateway® baseline services include application acceleration and compression, data redundancy elimination with byte caching and security.
UDgateway® software can be used as a standalone product or in combination with optional licenses to deliver value added services for vertical markets such as, but not limited to, maritime, oil & gas & mining, military installations.

Companies are looking to optimize their IT costs by consolidating servers and applications in data centers. This trend is being accelerated by server virtualization, remote desktop and cloud computing technologies. In this environment satisfactory end-user experience is critically dependent on excellent WAN performance. However, increasing WAN capacity can become expensive without significantly improving user satisfaction. When using satellite links in particular, pressure to optimize WAN traffic is even greater due to the harsh network conditions and limited bandwidth. UDgateway® greatly accelerates application performance, even in such highly constrained networks.
UDgateway® is a flexible platform consolidating WAN optimization features with routing/security/QoS and a set of value-added, optional services, in a single applicance, that can be tailored for vertical markets, such as –but not limited to- maritime, oil, gas & mining (optional services are documented in separate datasheets).

The open and flexible UDgateway® Service Platform helps SSPs turn ideas into new services that can be integrated into the UDgateway® Service Platform leveraging its core WAN optimization functionality to deliver competitive market flexibility.

Security A combination of stateful inspection firewall and VPN tunnel encryption enables protection of confidential data against intrusion and eavesdropping as well as accelerated VPN services.
Bandwidth Management Satellite-specific QoS features enable bandwidth saving and better user experience
Acceleration Improves application responsiveness
Compression Saves bandwidth costs and extents the number of concurrent users on a single line
Application Recognition Application aware firewall, policy-based (least cost) routing and improved QoS. Enables realtime traffic monitoring and management to provide enhanced performance of mission-critical traffic.


TCP Acceleration

When network latency increases, applications may not fully utilize the available bandwidth. Standard TCP implementations include flow controls, which greatly affect application throughput when encountering high latencies and/or packet loss. UDgateway TCP acceleration mitigates the effect of network latencies and manages TCP flow control in such a way that the WAN bandwidth utilization is maximized. TCP sessions are intercepted transparently. The embedded TCP proxy does not change IP addresses or ports and is tightly integrated with the UDgateway QoS module to optimize flow control performance. TCP bandwidth is also optimized by reducing TCP chattiness.

HTTP Pre-Fetching and Caching

Protocols requiring many round-trip dialogs are highly impacted by network latencies, whereas they would behave well in a LAN-like environment. HTTP pre-fetching analyzes the content of HTML pages and anticipates the web browser requests for embedded objects in the web page, such as scripts, style sheets and images. TheUDgateway receives and caches web objects before they are effectively requested by the web client and serves them when the client explicitly requests them, at LAN speed.

CIFS Enhancements

CIFS is the protocol underlying Microsoft networks. This protocol was originally developed for use over a LAN and is severely impacted when operated over WAN links due to the requirement for multiple round trips to perform relatively simple operation. UDgateway® anticipates LAN station requests by pre-fetching requests to servers and clients responses.


Packet payload and headers are compressed to reduce packet size. Within a TCP stream, connection-persistent GZIP compression greatly enhances the efficiency of compression. The compression technology makes sure that sent packets over the WAN are maximized in size to reduce the impact of overheads in application performance (ratio between application data and network bandwidth).

Data Deduplication

Users often send and receive repetitive traffic patterns.A common example relates to sending and: receiving email. Many people include the original text in the reply with new text in addition tothe existing mail body. Redundant data are also sent and received when a file is open, edited and saved on a remote server

Leveraging a unique dictionary management algorithm, WANcompress data deduplication technology is transparent and independent from transmitted content. It is therefore efficient for all types of traffic including text, image and video intensive applications. WANcompress is particularly useful in enterprise networks where email traffic can be intensive. By ensuring that only new parts of the emails are transmitted over the network, this can result in very significant bandwidth savings.

Table 1 illustrates the combination of compression techniques used by OneAccess on a file transfer example. The file is compressed when it is transmitted for the first time. It is simultaneously stored in the local and remote WANcompress dictionaries. The second time it is transferred, redundant bit streams are identified by WANcompress and replaced by lightweight labels enabling near LAN-like performance for end users.

Wireless IP Broadband Acceleration, Compression & Security
Table 1