Inteet only in short bursts on Mint 17.2

My cable DHCP ipv4 connection ( i've disabled ipv6 ) is working only in short bursts. It is mainly visible when performing a sudo apt-get install XXX because is only downloading the first MB and then is dead.

Also:

--2016-06-11 22:50:39-- http://proof.ovh.net/files/100Mb.dat Resolving proof.ovh.net (proof.ovh.net)... 2001:41d0:2:876a::1, 188.165.12.106 Connecting to proof.ovh.net (proof.ovh.net)|2001:41d0:2:876a::1|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 12500000 (12M) [application/octet-stream] Saving to: ‘/dev/null’

13% [=================>
] 1.693.890 --.-K/s eta 81s

You can observe the lack of speed indicator, and the progress is stuck at 13% ( it went there in under a second ).

My network card is Network:

Card: Realtek RTL8111/8168/8411 PCI Express Gigabit Etheet Controller driver: r8168

I've downloaded the

LINUX driver for keel 3.x and 2.6.x and 2.4.x 8.042 2016/5/12

from realtek website, but no performance boost.

I think is not due to my network card, because i've tried with another one, an USB network card with AXIS chipset at it has the same behaviour.

Any hints ?

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