Ifconfig: To view information about a network card that has already been activated to use the Ifconfig command, you must install the Net-tools program yum install net-tools-y
- Eno begins with the representation of the virtual machine NIC
- ETH for the presentation of the opening for the Real Machine (Ethernet card)
- Lo is the local loopback network card (data is transferred inside the machine)
- The MTU 1500 represents the maximum transmission unit of the NIC, which is 1500 bytes, and if the sending data is too large it will be sent in several parts
- inet 192 .... flag the IP address of the NIC
- Netmask 255 ... represents a subnet mask
- Broadcast for broadcast address
- Either for MAC address
Ifconfig vir ... (NIC name) 192 ... (IP address) netmask 255 .... (Subnet mask): Modify the IP address and subnet mask: Set a virtual network card, its MAC address is not changed: switch off the network card: Activate network card note: The above modification configuration is only a temporary modification, if you want to permanently modify the file, the file exists in/etc Files starting with ifcfg-in the/sysconfig/network-scrpts/directory
Open ifcfg-eno16777736
- Shows the type of network card, and other details
- UUID is the identity address of the NIC in the system
- Bootproto is the IP address obtained by DHCP (dynamic acquisition), if you need to permanently change to their own IP, you need to change DHCP to static (permanent)
- Modify IP also need to manually add the IP address ipaddr=192 .... (New IP address)
- Add subnet mask Manually netmask=255 .....
- Manually add Gateway gateway=192 .... (Same as the root gateway)
- Manually add DNS dns1=192 .... : DNS1 for first access, you can set a second, third
- Last set onboot = ' yes ' (activates the NIC at boot)
: CENTOS7 system control State Network: 7 Open Network services: 7 Shutdown Network services: 7 Restart Network services: View gateway and other information 1. If you want to access external Web sites, you first need to parse the URL, modify the parse file, the file path is/etc/ Resolv.conf2. Modify resolv.conf, add resolution nameserver 192 ... (Gateway only) 3. Add a gateway with a command after parsing: Route add default GW 192 ... (gateway address): Add Gateway: Delete Gateway Ping ip/URL: Used to test connectivity to the host the second part can also specify local parsing: Modify the/etc/hosts to directly specify that the address is written directly for the external site, his priority is higher than resolv.conf
Day8:linux Base slice: Network configuration
