Random Lan Behaviour

[ajaysharma2]

i am having a ubuntu 12.04 machine with two lan cards one configured for lan1 and another configured for lan2 after some time randomly lan2 stops responding and after enabling disabling the Lan2 it starts working again Kindly help as it is hampering my production

[ajgreeny]

12.04 is now end-of-life so it will be very difficult to help with that version, as no updates will be easily available.

I recommend that you clean install 16.04 or 17.10, both of which can be updated to the next LTS version, 18.04 easily.