"TCP/IP Over Satellite: Optimization Vs. Acceleration"
Source: End II End Communications
Both acceleration and optimization technologies help overcome satellite latency to varying degrees. Due to the nature of TCP transmissions, any performance increases achieved by the various acceleration methods are offset by serious compromises in data security. Fundamental incompatibilities arise when one attempts to operate conventional VPN devices over satellite links, due to the nature of TCP acceleration techniques commonly used for broadband satellite connections. VPNs may not function at all, security is compromised through the use of transport mode VPNs, and/or the lack of TCP acceleration can degrade application performance over satellite links so as to be unusable. Apart from this reduced security, most acceleration technologies enhance only certain types of applications (large file transfers, video).