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What happens if I disable the loopback device using ifconfig?

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4

I found out that I can disable my interfaces using

$ sudo ifconfig lo down

I want to know what happens if I disable my loopback interface forever. It's disabled now and nothing has changed. Are there any disadvantages that I can't see now?

networking ifconfig

share|improve this question

edited Oct 2 at 7:45

Community♦

1

asked Oct 1 at 19:53

Mohammad KholghiMohammad Kholghi

57344 silver badges2121 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Next time, search before asking: superuser.com/questions/521916/…
  
  – mikewhatever
  Oct 1 at 20:09
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @mikewhatever would you please explain about your link? That link is about if we can disable loopback interface from the kernel. I want to know what is the disadvantages of disabling loobpack using ifconfig command.
  
  – Mohammad Kholghi
  Oct 1 at 20:13
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  You may want to run sudo lsof -i and see for yourself.
  
  – mikewhatever
  Oct 1 at 21:07
  

  
  
  
  

add a comment
 | 

4

I found out that I can disable my interfaces using

$ sudo ifconfig lo down

I want to know what happens if I disable my loopback interface forever. It's disabled now and nothing has changed. Are there any disadvantages that I can't see now?

networking ifconfig

share|improve this question

edited Oct 2 at 7:45

Community♦

1

asked Oct 1 at 19:53

Mohammad KholghiMohammad Kholghi

57344 silver badges2121 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Next time, search before asking: superuser.com/questions/521916/…
  
  – mikewhatever
  Oct 1 at 20:09
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @mikewhatever would you please explain about your link? That link is about if we can disable loopback interface from the kernel. I want to know what is the disadvantages of disabling loobpack using ifconfig command.
  
  – Mohammad Kholghi
  Oct 1 at 20:13
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  You may want to run sudo lsof -i and see for yourself.
  
  – mikewhatever
  Oct 1 at 21:07
  

  
  
  
  

add a comment
 | 

I found out that I can disable my interfaces using

$ sudo ifconfig lo down

I want to know what happens if I disable my loopback interface forever. It's disabled now and nothing has changed. Are there any disadvantages that I can't see now?

networking ifconfig

share|improve this question

edited Oct 2 at 7:45

Community♦

1

asked Oct 1 at 19:53

Mohammad KholghiMohammad Kholghi

57344 silver badges2121 bronze badges

$ sudo ifconfig lo down

share|improve this question

edited Oct 2 at 7:45

Community♦

1

asked Oct 1 at 19:53

Mohammad KholghiMohammad Kholghi

57344 silver badges2121 bronze badges

share|improve this question

edited Oct 2 at 7:45

Community♦

1

asked Oct 1 at 19:53

Mohammad KholghiMohammad Kholghi

57344 silver badges2121 bronze badges

edited Oct 2 at 7:45

Community♦

1

edited Oct 2 at 7:45

Community♦

1

asked Oct 1 at 19:53

Mohammad KholghiMohammad Kholghi

57344 silver badges2121 bronze badges

asked Oct 1 at 19:53

Mohammad KholghiMohammad Kholghi

57344 silver badges2121 bronze badges

1 Answer
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It is used by various local services which will fail when lo is down. Many local service make use of a Unix socket and of course those will continue to work. Those using a TCP socket, however...

Here is a picture of my firewall and we can see that there are quite a few packets going through....

share|improve this answer

edited Oct 1 at 21:17

guntbert

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answered Oct 1 at 20:11

Alexis WilkeAlexis Wilke

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3

It is used by various local services which will fail when lo is down. Many local service make use of a Unix socket and of course those will continue to work. Those using a TCP socket, however...

Here is a picture of my firewall and we can see that there are quite a few packets going through....

share|improve this answer

edited Oct 1 at 21:17

guntbert

11.1k1313 gold badges3535 silver badges7676 bronze badges

answered Oct 1 at 20:11

Alexis WilkeAlexis Wilke

1,57122 gold badges1010 silver badges2929 bronze badges

add a comment
 | 

3

It is used by various local services which will fail when lo is down. Many local service make use of a Unix socket and of course those will continue to work. Those using a TCP socket, however...

Here is a picture of my firewall and we can see that there are quite a few packets going through....

share|improve this answer

edited Oct 1 at 21:17

guntbert

11.1k1313 gold badges3535 silver badges7676 bronze badges

answered Oct 1 at 20:11

Alexis WilkeAlexis Wilke

1,57122 gold badges1010 silver badges2929 bronze badges

add a comment
 | 

It is used by various local services which will fail when lo is down. Many local service make use of a Unix socket and of course those will continue to work. Those using a TCP socket, however...

Here is a picture of my firewall and we can see that there are quite a few packets going through....

share|improve this answer

edited Oct 1 at 21:17

guntbert

11.1k1313 gold badges3535 silver badges7676 bronze badges

answered Oct 1 at 20:11

Alexis WilkeAlexis Wilke

1,57122 gold badges1010 silver badges2929 bronze badges

share|improve this answer

edited Oct 1 at 21:17

guntbert

11.1k1313 gold badges3535 silver badges7676 bronze badges

answered Oct 1 at 20:11

Alexis WilkeAlexis Wilke

1,57122 gold badges1010 silver badges2929 bronze badges

edited Oct 1 at 21:17

guntbert

11.1k1313 gold badges3535 silver badges7676 bronze badges

edited Oct 1 at 21:17

guntbert

11.1k1313 gold badges3535 silver badges7676 bronze badges

answered Oct 1 at 20:11

Alexis WilkeAlexis Wilke

1,57122 gold badges1010 silver badges2929 bronze badges

answered Oct 1 at 20:11

Alexis WilkeAlexis Wilke

1,57122 gold badges1010 silver badges2929 bronze badges