The SYN/ACK speedup procedure is used to speed up IP data traffic. In SYN/ACK speedup, IP control characters (SYN for synchronization and ACK for acknowledge) within the send buffer are given priority over simple data packets. This avoids the situation where control characters remain in the send queue for a longer time and the remote terminal therefore stops sending data.
The greatest effect of SYN/ACK speedup occurs with fast connections (e.g. ADSL) when data is transmitted simultaneously in both directions at high speed.
The SYN/ACK speedup is switched on at the factory.
