Slow solution using SSH to access remote hosts

Recently in the use of SSH remote access to the Linux server, found that some machine access quickly, enter the user name, immediately appear to enter the password prompts, immediately after entering. (Senior has made the change)

However, most of our servers need to wait a few 10 seconds before the prompt to enter a password appears. Asked the next brother, senior said there is a DNS reverse resolution problem, the Internet search it.

Got the result:

"Analysis results, the main reason is: DNS resolution IP caused by the use of the following types of analysis processing methods

1, in the server/etc/hosts file in your native IP and hostname to join
2. Modify or join Usedns=no in/etc/ssh/sshd_config file on server
3. Comment off all IP rows not used in/etc/resolv.conf on the server
4, modify the server on the/etc/nsswitch.conf hosts for Hosts:files
5. Authentication gssapi-with-mic may also have problems, modifying Gssapiauthentication No in/etc/ssh/sshd_config files on the server. /etc/init.d/sshd Restart Restart the sshd process to make the configuration effective.
If the server was previously configured with a dual NIC, so that a row in the/etc/resolv.conf file a line of the current unused IP address. Comment or delete the line. “

Reference: http://www.hao32.com/unix-linux/491.html

I tested the mode 2 on my two servers, and it was easy to use. respectively, SUSE11 and Fedora 17.

When you are ready, remember to restart the SSHD service .

SUSE:/etc/init.d/sshd Restart

Fedora 17:systemctl Restart Sshd.service

Then, and then login again, found that the user name entered immediately after the choice of input password. Oh, also