3 TcpRcvBuf=[int]KB client
4 set the TCP socket receive buffer to n Kilobytes. It can be set up to the
5 maximum socket size allowed by the system. This is useful in situations where
6 the tcp receive window is set low but the maximum buffer size is set
7 higher (as is typical). This works on a per TCP connection basis. You can also
8 use this to artifically limit the transfer rate of the connection. In these
9 cases the throughput will be no more than n/RTT. The minimum buffer size is 1KB.
10 Default is the current system wide tcp receive buffer size.
12 TcpRcvBufPoll=[yes/no] client/server
13 enable of disable the polling of the tcp receive buffer through the life
14 of the connection. You would want to make sure that this option is enabled
15 for systems making use of autotuning kernels (linux 2.4.24+, 2.6, MS Vista)
18 NoneEnabled=[yes/no] client/server
19 enable or disable the use of the None cipher. Care must always be used
20 when enabling this as it will allow users to send data in the clear. However,
21 it is important to note that authentication information remains encrypted
22 even if this option is enabled. Set to no by default.
24 NoneSwitch=[yes/no] client
25 Switch the encryption cipher being used to the None cipher after
26 authentication takes place. NoneEnabled must be enabled on both the client
27 and server side of the connection. When the connection switches to the NONE
28 cipher a warning is sent to STDERR. The connection attempt will fail with an
29 error if a client requests a NoneSwitch from the server that does not explicitly
30 have NoneEnabled set to yes. Note: The NONE cipher cannot be used in
31 interactive (shell) sessions and it will fail silently. Set to no by default.
33 HPNDisabled=[yes/no] client/server
34 In some situations, such as transfers on a local area network, the impact
35 of the HPN code produces a net decrease in performance. In these cases it is
36 helpful to disable the HPN functionality. By default HPNDisabled is set to no.
38 HPNBufferSize=[int]KB client/server
39 This is the default buffer size the HPN functionality uses when interacting
40 with nonHPN SSH installations. Conceptually this is similar to the TcpRcvBuf
41 option as applied to the internal SSH flow control. This value can range from
42 1KB to 14MB (1-14336). Use of oversized or undersized buffers can cause performance
43 problems depending on the length of the network path. The default size of this buffer
44 is 2MB. TcpRcvBufPoll, if set to yes, will override this value. This behaviour may
45 change in future versions.