Hello Dod, > The connection will be > aborted after the number of retransmissions specified by > TcpMaxDataRetransmissions have gone unanswered.
Does this means that there should be also a property TcpMaxDataRetransmissions ? And I also think this will have impact if there is many packet loss. Or do I miss something ? --- Rgds, Wilfried [TeamICS] http://www.overbyte.be/eng/overbyte/teamics.html http://www.mestdagh.biz Wednesday, March 8, 2006, 10:13, Dod wrote: > Hello, > About KeepAlive, here is what I found in a old TCP-IP NT5.0 white > paper from Microsoft. > TCP Keep-alive Messages > A TCP keep-alive packet is simply an ACK with the sequence number set > to one less than the current sequence number for the connection. A > host receiving one of these ACKs will respond with an ACK for the > current sequence number. Keep-alives can be used to verify that the > computer at the remote end of a connection is still available. TCP > keep-alives can be sent once every KeepAliveTime (defaults to > 7,200,000 milliseconds or two hours), if no other data or higher level > keep-alives have been carried over the TCP connection. If there is no > response to a keep-alive, it is repeated once every KeepAliveInterval > seconds. KeepAliveInterval defaults to 1 second. NetBT connections, > such as those used by many Microsoft networking components, send > NetBIOS keep-alives more frequently, so normally no TCP keep-alives > will be sent on a NetBIOS connection. TCP keep-alives are disabled by > default, but Windows Sockets applications can use the SetSockOpt > function to enable them. > Registry key start from : > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ > KeepAliveInterval > Key: Tcpip\Parameters > Value Type: REG_DWORD-Time in milliseconds > Valid Range: 1-0xFFFFFFFF > Default: 1000 (one second) > Description: This parameter determines the interval between keep-alive > retransmissions until a response is received. Once a response is > received, the delay until the next keep-alive transmission is again > controlled by the value of KeepAliveTime. The connection will be > aborted after the number of retransmissions specified by > TcpMaxDataRetransmissions have gone unanswered. > KeepAliveTime > Key: Tcpip\Parameters > Value Type: REG_DWORD-Time in milliseconds > Valid Range: 1-0xFFFFFFFF > Default: 7,200,000 (two hours) > Description: The parameter controls how often TCP attempts to verify > that an idle connection is still intact by sending a keep-alive > packet. If the remote system is still reachable and functioning, it > will acknowledge the keep-alive transmission. Keep-alive packets are > not sent by default. This feature may be enabled on a connection by an > application. -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
