In Centos, check whether a port of another host is started.

Take LINUXREDHAT6.3 as an example: insert REDHAT6.3 system ISO image CD11. configure yum local installation Source: log on to the system mkdir/mnt/cdrommount-tiso9660/dev/sr0/mnt/cdromcd/etc/yum as the root user. repos. d

Take LINUX REDHAT6.3 as an example:

Insert REDHAT6.3 system ISO image CD1 to the local machine

1. configure the local installation source of yum:

Log on to the system as a root user

Mkdir/mnt/cdrom

Mount-t iso9660/dev/sr0/mnt/cdrom

Cd/etc/yum. repos. d

Check whether A. repo suffix file exists in the directory. if No. repo file exists, create a. repo file. the file name is random.

Vi local. repo

[LOCAL]name=localbaseurl=file:///mnt/cdromenable=1gpgcheck=0

Yum clean all

2. install nmap and test whether port 80 is enabled for 172.24.40.5.

[root@openlab named]# yum install nmap Loaded plugins: rhnplugin Repository 'LOCAL' is missing name in configuration, using id This system is not registered with RHN. RHN support will be disabled. Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package nmap.i686 2:5.21-3.el6 set to be updated --> Finished Dependency Resolution  Dependencies Resolved  ================================================================================  Package         Arch            Version                 Repository        Size ================================================================================ Installing:  nmap            i686            2:5.21-3.el6            LOCAL            2.2 M  Transaction Summary ================================================================================ Install       1 Package(s) Upgrade       0 Package(s)  Total download size: 2.2 M Installed size: 7.2 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction   Installing     : 2:nmap-5.21-3.el6.i686                                   1/1   Installed:   nmap.i686 2:5.21-3.el6                                                          Complete! 

[root@openlab named]# nmap -p 80 172.24.40.5  Starting Nmap 5.21 ( http://nmap.org ) at 2013-01-09 17:00 CST mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns-servers Nmap scan report for 172.24.40.5 Host is up (0.00034s latency). PORT   STATE SERVICE 80/tcp open  http MAC Address: 00:0C:29:4E:7D:FE (VMware)  Nmap done: 1 IP address (1 host up) scanned in 0.07 seconds 
Nmap-p 1-200 destination host IP

#1-200 is the port range