☰

连接到虚拟 SSH（驻留在同一台机器上）时延迟较小

tag-icon • tag-icon linux ssh debian openssh
连接到虚拟 SSH（驻留在同一台机器上）时延迟较小

我在 Windows 7 主机操作系统上设置了一个虚拟机 - Debian 6.0.4。我使用 VirtualBox 作为软件。

最近我开始使用 ssh，但我注意到当我通过 ssh（例如 Putty）登录虚拟机时，在输入用户名和密码提示之间会有短暂的延迟（大约 5 秒）。通过 sftp 访问时也会有这种延迟。

我用openssh-server 1:5.5p1-6+squeeze1。

登录后，一切运行正常。有人知道哪里出了问题吗？

这是我的sshd_config

# Package generated configuration file
# See the sshd_config(5) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes

#Subsystem sftp /usr/lib/openssh/sftp-server

Subsystem     sftp   internal-sftp
Match Group sftp
    ChrootDirectory /home/%u
    ForceCommand internal-sftp
    AllowTcpForwarding no
    X11Forwarding no

答案1

您可能想要添加UseDNS no到sshd_config，我在我的一个系统上使用了它来减少登录期间的延迟。

答案2

这表明您登录的 IP 地址无法解析到主机。 who am i可能会显示类似patryk pts/0 2012-02-20 15:09 (10.9.8.7)而不是 的内容patryk pts/0 2012-02-20 15:09 (my.groovy.host)。这可能很简单，因为您登录的主机没有反向 DNS ssh。但是，我敢打赌，您没有设置任何内容/etc/resolv.conf，因此ping superuser.com会失败。

相关内容