Modifying the IP address and gateway is a very common operation. When doing related experiments, if it is not set well, it will bring a lot of unnecessary troubles..
1. Modify IP address
vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
BROADCAST=192.168.1.255
IPADDR=192.168.1.33
NETMASK=255.255.255.0
NETWORK=192.168.1.0
ONBOOT=yes
USERCTL=no
PEERDNS=no
TYPE=Ethernet
If there are 2 NICs, the information about the second one is stored in the ifcfg-eth1 file.
vi /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
ONBOOT=yes
BOOTPROTO=none
IPADDR=192.168.2.34
NETMASK=255.255.255.0
USERCTL=no
PEERDNS=no
TYPE=Ethernet
NETWORK=192.168.2.0
BROADCAST=192.168.2.255
2. Modify the gateway
vi /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=Aaron
GATEWAY=192.168.1.1
3. Restart the network configuration: After modifying the IP and gateway, the network service must be restarted to take effect.
/etc/init.d/network restart
4. The DNS configuration information of this machine is in: /etc/resolv.conf
[root@localhost etc]#cat resolv.conf
nameserver xxx.xxx.xxx.xxx
//This is the DNS server address you configured or assigned by DHCP, you can also manually modify this address