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Virtual Private Networks over Satelliteatrexx offer unique VPN over satellite solutions available nearly everywhere. The standards compliant VPN connectivity performs with high speed data rates up to 2 Mbps. IPsec provides end-to-end security at the highest level. Utilizing the shared infrastructure of public Internet over Satellite results in an cost effective corporate network, available world-wide. Thus, satellites are ideal for providing Internet and private network access over long distances and to remote locations. However, the Internet protocols are not optimized for satellite communications. Satellite conditions adversely interact with a number of elements of the TCP architecture, including its window sizing, congestion avoidance algorithms, and data acknowledgment mechanisms, which combine to severely constrict the data throughput rate that can be achieved over satellite links. These limitations are normally overcome by a process called "TCP Acceleration" which is often integrated in the Indoor Unit (IDU). In the case of the LinkStar™ based 2way2sat services offered by atrexx, TCP Acceleration is performed by the LinkStar™ terminal. TCP Acceleration increases the throughput and efficiency of network access over satellites by transparently replacing TCP with a protocol optimized for the long latency, high loss and asymmetric bandwidth conditions - all typical of satellite communications.
Together with UDcast, atrexx has developed a solution which overcomes the limitations of VPN by Satellite. In the appliances of the UDgateway VPN product family, TCP Acceleration takes places outside the IPsec VPN tunnel, intercepting and enhancing the unencrypted packets. VPN hardware performs subsequently the industry-standard IPsec encryption protocol for the highest level of security, providing end-to-end encryption. The UDgateway VPN system is composed of VPN servers and VPN clients which all feature NAT/ FW/ DHCP/TCP acceleration, HTTP pre-fetching and IPsec encryption. Depending on the number of sites, the following equipment is installed at the headquarters and the subsidiaries:
So, if your needs are for an affordable corporate network using public Internet resources in regions not reachable by traditional service providers or as a back-up to an existing VPN, atrexx has the right solution. |
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VPN over Satellite
  2way2sat - IP-Connect Solution
IP Connect is a reliable, flexible, high-performance two-way broadband satellite solution, offering dedicated and thus guaranteed bandwidth. It is designed specifically for companies or closed user groups, allowing them to interconnect sites, or to implement a Virtual Private Network (VPN).  VPN Appliance
VPN Gateways enable the seamless integration of satellite into corporate networks, such as standards based site-to-site VPNs and offer full support for enterprise applications.  Corporate Networks and VPN
Satellite systems can be used for interactive communications. VSAT networks offer value-added satellite-based services for private and public network communications solutions  Accelerated Secure VPN over Satellite
Operators of satellite based corporate networks had always to make a trade-off between functionality and security. However, today more than ever, remote locations require both access to their business critical applications with end-to-end Quality of Service (QoS) and industrial grade security. |
However, in order to achieve this connection interception and protocol translation process, the IDU must be able to read the headers of the TCP packets. Data security solutions used for Virtual Private Networks (VPN), such as IP Security (IPsec), which encrypt the TCP header along with the data, interfere with the satellite link acceleration technology. The result is a dramatic loss of network performance.
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