Manual IP address and DNS modification in Linux (Red Hat 5.5)

Edit the ifcfg-eth0 file under/etc/sysconfig/networking-scripts/(if not, determine whether the NIC driver is installed)

Cd/etc/sysconfig/network-scripts

Vi ifcfg-eth0

--------------------------------------------

DEVICE = eth0
BOOTPROTO = none
IPADDR = 192.168.110.20.
NETMASK = 255.255.255.0
GATEWAY = 192.168.110.20.
DNS1 = 8.8.8.8
ONBOOT = yes
HWADDR = 50: e5: 49: ce: 27: e8
TYPE = Ethernet

Save as needed

Restart the NIC: ifdown eth0

Ifup eth0

Notify the gateway to update the information if necessary.

/Etc/init. d/network restart

Bytes ------------------------------------------------------------------------------------------

Summary:

1. Temporary Dynamic ip address Modification

Terminal command: ifconfig eth0 10.10.21.149

The ip address of the eth0 Nic is changed to 10.10.21.149, which takes effect immediately after modification. However, the ip address becomes invalid after the machine is restarted.

2. static ip address Modification

Vi/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE = eth0
# Physical device name

ONBOOT = yes
# [Yes | no] whether to activate the device during boot

BOOTPROTO = static # none: protocol not used during boot, static: static allocation, bootp: BOOTP protocol, dhcp: DHCP protocol

IPADDR = 192.168.0.3 # IP Address

NETMASK = 255.255.255.0 # mask

GATEWAY = 192.168.0.1 # GATEWAY address