在linux上使用ssh客戶端連接另一臺的linux服務器時，出現了連接慢的情況。但是換一臺客戶端去連發現速度正常。推測ssh客戶端出現為問題。

于是使用使用ssh -v ?IP 調試，果然發現問題。輸出如下：

[root@jump1 ~]# ssh -v 10.60.9.32

OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: Applying options for *

debug1: Connecting to 10.60.9.32 [10.60.9.32] port 22.

debug1: Connection established.

debug1: permanently_set_uid: 0/0

debug1: identity file /root/.ssh/identity type -1

debug1: identity file /root/.ssh/identity-cert type -1

debug1: identity file /root/.ssh/id_rsa type -1

debug1: identity file /root/.ssh/id_rsa-cert type -1

debug1: identity file /root/.ssh/id_dsa type -1

debug1: identity file /root/.ssh/id_dsa-cert type -1

debug1: identity file /root/.ssh/id_ecdsa type -1

debug1: identity file /root/.ssh/id_ecdsa-cert 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_5.3

debug1: SSH2_MSG_KEXINIT sent

debug1: SSH2_MSG_KEXINIT received

debug1: kex: server->client aes128-ctr hmac-md5 none

debug1: kex: client->server aes128-ctr 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 '10.60.9.32' is known and matches the RSA host key.

debug1: Found key in /root/.ssh/known_hosts:9

debug1: ssh_rsa_verify: signature correct

debug1: SSH2_MSG_NEWKEYS sent

debug1: expecting SSH2_MSG_NEWKEYS

debug1: SSH2_MSG_NEWKEYS received

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

可在最后一條，應該和“?gssapi-with-mic”有關，經過排查，終于發現問題，果然是ssh客戶端文件有問題。是ssh客戶端連接時會進行反向查詢所致。

修改方法如下：

修改本機的客戶端配置文件ssh_config，注意，不是ssh_config

vi /etc/ssh/ssh_config

找到?

GSSAPIAuthentication yes?

改為?

GSSAPIAuthentication no?

再去試一下，速度正常了

轉載于:https://blog.51cto.com/koala003/1689914

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