What should I do if ssh is slow to connect to other Linux machines?

When ssh is connected to other Linux machines, sometimes this problem occurs. Although it can be connected, the connection speed is very slow and it takes a lot of time. The following small series will introduce you to the slow resolution of ssh connection to Linux machines. Method, interested friends can come to understand.

in the LAN can ping the target machine, and delay microseconds.

Using ssh to connect to other Linux machines in the LAN, you will wait 10-30 seconds before you are prompted to enter your password. Seriously affect work efficiency.

CentOS has the same effect after modification

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Client Operating System Version:

cat /etc/lsb-release

DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=9.10

DISTRIB_CODENAME =karmic

DISTRIB_DESCRIPTION=“Ubuntu 9.10”0

============================ ======

Debugging information:

[root@IBM ~]# ssh -v 10.10.10.100

OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: Applying options for *

debug1: Connecting to 10.10.10.100 [10.10.10.100] port 22 .

debug1: connect to address 10.10.10.100 port 22: Connection refused

ssh: connect to host 10.10.10.100 port 22: Connection refused

----- -----------[Debugging information on the network]----------------------

ssh -v 192.168 .12.16

OpenSSH_5.1p1 Debian-6ubuntu2, OpenSSL 0.9.8g 19 Oct 2007

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: Applying options for *

debug1 : Connecting to 192.168.12.16 [192.168.12.16] port 22.

debug1: Connection established.

debug1: identity file /home/zhouhh/.ssh/identity type -1

debug1: identity file /home/zhouhh/.ssh/id_rsa type -1

debug1: identity file /home/zhouhh/.ssh/id_dsa type -1

debug1: Remote Protocol version 2.0, remote software version OpenSSH_4.3

debug1: match: OpenSSH_4.3 pat OpenSSH_4*

debug1: Enabling compatibility mode for protocol 2.0

debug1: Local version String SSH-2.0-OpenSSH_5.1p1 Debian-6ubuntu2

debug1: SSH2_MSG_KEXINIT sent

debug1: SSH2_MSG_KEXINIT received

debug1: kex: server-"client aes128-cbc hmac- Md5 none

debug1 Kex: client-"server aes128-cbc hmac-md5 none

debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024"1024"8192) sent

debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP

debug1: SSH2_MSG_KEX_DH_GEX_INIT sent

debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY

debug1: Host ‘192.168.12.16’ is known and matches the RSA host key.

debug1: Found key in /home/zhouhh /.ssh/known_hosts:1

debug1: ssh_rsa_verify: signature correct

debug1: SSH2_MSG_NEWKEYS sent

debug1: expecting SSH2_MSG_NEWKEYS

debug1: SSH2_MSG_NEWKEYS received< Br>

debug1: SSH2_MSG_SERVICE_REQUEST sent

debug1: SSH2_MSG_SERVICE_ACCEPT received

debug1: Authentications that can continue: publickey,gssapi-with-mic,password

debug1: Next Authentication method: gssapi-with-mic

debug1: An invalid name was supplied

Cannot determine realm for numeric host address

debug1: An invalid name was supplied

Cannot determine realm for numeric host address

debug1: An invalid name was supplied

debug1: Next authentication method: publickey

debug1: Trying private key: /home/zhouhh/.ssh/identity

debug1: Trying private key: /home/zhouhh /.ssh/id_rsa

debug1: Trying private key: /home/zhouhh/.ssh/id_dsa

debug1: Next authentication method: password

password:

debug1: Authentication succeeded (password).

debug1: channel 0: new [client-session]

debug1: Entering interactive session.

debug1: Sending environment.

debug1: Sending env LANG = zh_CN.UTF-8

Last login: Fri Dec 25 13:35:04 2009 from 192.168.11.146
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