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I have an ubuntu 18.04 linux server.

Why does the command(ifconfig eth) says Device not found whereas this command(ifconfig eth0) works?

$ ifconfig eth eth: error fetching interface information: Device not found $ ifconfig eth0 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9001 inet 96.114.208.69 netmask 255.255.255.128 broadcast 96.114.208.127 inet6 fe80::8a9:12ff:fe5b:c324 prefixlen 64 scopeid 0x20<link> ether 0a:a9:12:5b:c3:24 txqueuelen 1000 (Ethernet) RX packets 5126229 bytes 7622036755 (7.6 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1823543 bytes 124228703 (124.2 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Note: I tried the same thing on my other 14.04 linux server. Both commands are working

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1
  • Post the output from the working system
    – Raman Sailopal
    CommentedAug 17, 2018 at 12:11

1 Answer 1

Reset to default
2

Because you don' t have any eth device, but you have the eth0.
If you use ifconfig -a or ip addr you can see all the devices available.

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5
  • on ubuntu 14.04 server, both commands returns same output
    – Nani
    CommentedAug 17, 2018 at 14:03
  • ubuntu@ip-96-114-208-17:~$ ifconfig eth eth0 Link encap:Ethernet HWaddr 0a:c6:8c:f3:88:84 inet addr:96.114.208.17 Bcast:96.114.208.127 Mask:255.255.255.128 inet6 addr: fe80::8c6:8cff:fef3:8884/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:9001 Metric:1 RX packets:3073083 errors:0 dropped:0 overruns:0 frame:0 TX packets:17790249 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:628310363 (628.3 MB) TX bytes:25682765383 (25.6 GB)
    – Nani
    CommentedAug 17, 2018 at 14:05
  • ubuntu@ip-96-114-208-17:~$ ifconfig eth0 eth0 Link encap:Ethernet HWaddr 0a:c6:8c:f3:88:84 inet addr:96.114.208.17 Bcast:96.114.208.127 Mask:255.255.255.128 inet6 addr: fe80::8c6:8cff:fef3:8884/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:9001 Metric:1 RX packets:3073247 errors:0 dropped:0 overruns:0 frame:0 TX packets:17792171 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:628338790 (628.3 MB) TX bytes:25685051888 (25.6 GB)
    – Nani
    CommentedAug 17, 2018 at 14:06
  • In the question you said that the output is different and that you are using ubuntu 18.04 server and not the 14.04. What is the output of ifconfig -a ?
    – Scorpion
    CommentedAug 17, 2018 at 19:00
  • @Nani it's probably a good idea to omit your public IP address from your PS1 (since it contains your IP) and the output of ifconfig. Also formatting in a comment can be difficult to read, so you would likely get a better response if you're to amend your question with those outputs rather than in the comments :)
    – RobotJohnny
    CommentedAug 20, 2018 at 8:13

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