Configure Static and Dynamic Network Settings on a CentOS 6.7 VM

Static Network Configuration

1. Log into the virtual machine with your credentials.

2. Open the network interface configuration file: vi /etc/sysconfig/network-scripts/ifcfg-eth0 3. Modify the file so that ONBOOT=yes and BOOTPROTO=static, then add the required network parameters:

IPADDR=your_ip_address

NETMASK=your_subnet_mask

GATEWAY=your_gateway

DNS1=primary_dns

DNS2=secondary_dns

4. Save and exit the editor ( :wq!).

5. Verify the changes: cat /etc/sysconfig/network-scripts/ifcfg-eth0 6. Stop the firewall: service ip6tables stop 7. Restart the network service: service network restart 8. Check the assigned IP address: ifconfig 9. Test connectivity by pinging an external site:

ping www.baidu.com

Dynamic Network Configuration (DHCP)

1. Edit the same interface file: vi /etc/sysconfig/network-scripts/ifcfg-eth0 2. Ensure ONBOOT=yes is set and leave other parameters at their defaults to use DHCP.

3. Save and exit, then restart the network service: service network restart 4. Verify the dynamically assigned IP address:

ifconfig

Note: DHCP assigns IPs dynamically, which may not be suitable for environments like Hadoop clusters that require stable static addresses.