sshd_config 连接数常用的参数设置（备忘）

最新推荐文章于 2024-09-10 08:36:09 发布

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路径： /etc/ssh/sshd_config

ClientAliveInterval 间隔发送客户端ssh心跳alive
Sets a timeout interval in seconds after which if no data has been received from the client, sshd(8) will send a message through the encrypted channel to request a response from the client. The default is 0, indicating that these messages will not be sent to the client. This option applies to protocol version 2 only.

ClientAliveInterval   60

MaxSessions 最大连接数
Specifies the maximum number of open sessions permitted per network connection. The default is 10.

MaxSessions 60

MaxStartups 未授权连接的最大连接数
Specifies the maximum number of concurrent unauthenticated connections to the SSH daemon. Additional connections will be dropped until authentication succeeds or the LoginGraceTime expires for a connection. The default is 10.

Alternatively, random early drop can be enabled by specifying the three colon separated values ‘‘start:rate:full’’ (e.g. “10:30:60”). sshd(8) will refuse connection attempts with a probability of ‘‘rate/100’’ (30%) if there are currently ‘‘start’’ (10) unauthenticated connections. The probability increases linearly and all connection attempts are refused if the number of unauthenticated connections reaches ‘‘full’’ (60).