Linux Tutorials - Herong's Tutorial Examples - v5.34, by Dr. Herong Yang
Setup Ethernet Connection on CentOS
Provides a tutorial example on how to review and troubleshoot Ethernet connection on CentOS 8 systems.
If you are running a CentOS system on a desktop computer, it is most likely having an Ethernet connection to the local network. Here is what I did to review and setup the Ethernet connection on my CentOS 8 computer.
1. Make sure the computer is connected with an Ethernet cable to the local network. You should see two lights next to the Ethernet port. If one of them is blinking, then there are some data activities between your computer and the network.
2. Review Ethernet connection settings from the desktop screen.
3. Read the Wired connection details. By default, your IP address, default route (gateway), DNS are dynamically configured by the DHCP (Dynamic Host Configuration Protocol) service from the local network. There is no need to change them.
Link Speed: 100 Mb/s IPv4 Address: 192.168.1.100 Hardware Address: ... Default Route: 192.168.1.1 DNS: 192.168.1.1
4. You can also verify the Ethernet connection with the "ifconfig" command:
herong$ ifconfig eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.100 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::...:fe80 prefixlen 64 scopeid 0x20<link> ether 39:39:... txqueuelen 1000 (Ethernet) RX packets 1162982 bytes 311120747 (296.7 MiB) RX errors 0 dropped 61365 overruns 0 frame 0 TX packets 247671 bytes 58741459 (56.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 20 memory 0xf7c00000-f7c20000
5. Verify the Internet connection using the "ping" command:
herong$ ping bing.com PING bing.com (126.96.36.199) 56(84) bytes of data. 64 bytes from a-0001.a-msedge.net (188.8.131.52): icmp_seq=1 ttl=118 time=21.1 ms 64 bytes from a-0001.a-msedge.net (184.108.40.206): icmp_seq=2 ttl=118 time=20.9 ms ... 64 bytes from a-0001.a-msedge.net (220.127.116.11): icmp_seq=9 ttl=118 time=20.8 ms ^C --- bing.com ping statistics --- 9 packets transmitted, 9 received, 0% packet loss, time 18ms rtt min/avg/max/mdev = 20.658/21.993/30.929/3.163 ms
6. Check the following if the "ping" command fails:
7. If you have trouble connecting to the Internet during CentOS installation, you can download the *-dvd1.iso version to install CentOS from the ISO image without Internet connection.
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