eth: error fetching interface information: Device not found

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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






ubuntu ifconfig interface







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  • Post the output from the working system
    – Raman Sailopal
    Aug 17 at 12:11














up vote
-1
down vote

favorite












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






ubuntu ifconfig interface







share|improve this question























  • Post the output from the working system
    – Raman Sailopal
    Aug 17 at 12:11












up vote
-1
down vote

favorite









up vote
-1
down vote

favorite











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






ubuntu ifconfig interface







share|improve this question















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






ubuntu ifconfig interface




ubuntu ifconfig interface






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Aug 17 at 12:48









GAD3R

22.8k154895




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asked Aug 17 at 11:42









Nani

173




173











  • Post the output from the working system
    – Raman Sailopal
    Aug 17 at 12:11
















  • Post the output from the working system
    – Raman Sailopal
    Aug 17 at 12:11















Post the output from the working system
– Raman Sailopal
Aug 17 at 12:11




Post the output from the working system
– Raman Sailopal
Aug 17 at 12:11










1 Answer
1






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oldest

votes

















up vote
2
down vote













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.






share|improve this answer






















  • on ubuntu 14.04 server, both commands returns same output
    – Nani
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 20 at 8:13










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1 Answer
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active

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1 Answer
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active

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up vote
2
down vote













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.






share|improve this answer






















  • on ubuntu 14.04 server, both commands returns same output
    – Nani
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 20 at 8:13














up vote
2
down vote













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.






share|improve this answer






















  • on ubuntu 14.04 server, both commands returns same output
    – Nani
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 20 at 8:13












up vote
2
down vote










up vote
2
down vote









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.






share|improve this answer














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.







share|improve this answer














share|improve this answer



share|improve this answer








edited Aug 17 at 16:09









RobotJohnny

675216




675216










answered Aug 17 at 12:19









Scorpion

543




543











  • on ubuntu 14.04 server, both commands returns same output
    – Nani
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 20 at 8:13
















  • on ubuntu 14.04 server, both commands returns same output
    – Nani
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 17 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
    Aug 20 at 8:13















on ubuntu 14.04 server, both commands returns same output
– Nani
Aug 17 at 14:03




on ubuntu 14.04 server, both commands returns same output
– Nani
Aug 17 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
Aug 17 at 14:05





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
Aug 17 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
Aug 17 at 14:06




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
Aug 17 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
Aug 17 at 19:00





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
Aug 17 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
Aug 20 at 8:13




@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
Aug 20 at 8:13

















 

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