Berkley Snoop for Linux is a module which adds support for the Snoop protocol, a TCP-aware link layer protocol designed that can improve the performance of TCP over networks of wired and single-hop wireless links.
While TCP adapts well to network congestion, it does not adequately handle the vagaries of wireless media. In this thesis, we address these challenges in detail and design solutions to them. These solutions incorporate link-layer techniques as well as enhancements to TCP at the sender and receiver. The Snoop protocol is a TCP-aware link layer protocol designed to improve the performance of TCP over networks of wired and single-hop wireless links.
The implementation is for kernels of 2.6.x series. This software is intended to use on routers acting between big fat pipe(BFP) link and wireless link.
The problem: The wireless link is error prone by its nature and BFP links such as satellite one has very big round-trip time. When error occurs on wireless segment it causes in speed reduction because the TCP protocol on sending side treats this error as link congestion although the error was just a temporary link quality loss and the connection cann't recover its speed.
The fix: The module will cache TCP segmets passing to host on wireless segment until the ACK(nowledgmet) is received or timeout expired. In case of timeout the segment will be retransmitted again. And by the way the module will drop all DUP(licate) ACK(nowledgmets) caused by packet loss on wireless segment and prevent the reduction of speed of flow from the host beyond the satellite link. The module works now only with connections initiated from wireless hosts.
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