Dual-nic computer linux operating system multiple services reverse DNS resolution

Dual-nic computer linux operating system multiple services reverse DNS resolution problem solution overview-Linux Enterprise Application-Linux server application information, the following is a detailed reading. Many Computers are installed with dual NICs. When connecting to the Intranet, many services may encounter connection timeout. The most likely reason is that these services are applied to reverse DNS, as a result, the query times out.

The following solutions are available in several services:

1. ssh.
In/etc/ssh/sshd_config, change UseDNS yes to UseDNS no, edit/etc/nsswitch. conf to find the hosts line, and change it to hosts: files dns [NOTFOUND = return].

2. mysql: Modify the mysql Startup File. server Changes $ bindir/mysqld_safe -- datadir = $ datadir -- pid-file = $ server_pid_file>/dev/null 2> & 1 wait_for_pid created to $ bindir/mysqld_safe -- skip- name-resolve -- datadir = $ datadir -- pid-file = $ server_pid_file>/dev/null 2> & 1 wait_for_pid created, that is, the -- skip-name-resolve startup option is added.

3. Modify the UseReverseDNS option of the configuration file proftpd. conf to off.