wired network drops after few minutes / seconds

Question

Recently I installed ubuntu 14.04 on my new laptop, lenovo L440.

will doing the installation I used wifi.

With a wifi everything works perfectly, the problem is when i plugged a lan cable.

The OS recognized the new connection and I can see the 2 arrows, I am also get a connection for few minutes/seconds.

The problem is that I can't connect to internet after minutes. The connection indicator (2 arrows) still shows me I am connect to the network. Also if i press on the connection it reconnect but drops again.

Any suggestion will be greatly appreciate.

aviram83 · Accepted Answer · 2014-08-28T09:00:37.493

2

I have been edited the file NetworkManager.conf

from /etc/NetworkManager/NetworkManager.conf

set:

[ifupdown]

managed=true

edited Aug 28 '14 at 09:00

answered Aug 28 '14 at 08:50

aviram83

141

score 0 · Answer 2 · edited Apr 13 '17 at 12:24

0

I recommend this answer: https://askubuntu.com/a/736589/194156

At least it does not take long to try: go to Network Manager, and set MTU size to 8192 bytes. And reboot.

This worked instantly for me. After I changed MTU size back to "Automatic", it stopped working immediately. So that must be it.

edited Apr 13 '17 at 12:24

Community

1

answered Aug 29 '16 at 07:51

Xin

121
1
5

wired network drops after few minutes / seconds

2 Answers2