Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am using Ubuntu 14.04 (did a clean install from Ubuntu 13.10 recently) on my Desktop machine. Since the upgrade, my system has started showing strange behavior of intermittent disconnections in browsing. At that specific moment pinging the proxy server times out with more than 80% packet lost, or is unreachable. During this time the LAN connection is 'Connected', but starts to work only after I reset it.

Example of Packet Loss

user@user-desktop:~$ ping PING
( 56(84) bytes of data.
64 bytes from icmp_seq=13 ttl=128 time=0.283 ms
64 bytes from icmp_seq=14 ttl=128 time=0.275 ms
64 bytes from icmp_seq=15 ttl=128 time=0.303 ms
64 bytes from icmp_seq=16 ttl=128 time=0.272 ms
64 bytes from icmp_seq=17 ttl=128 time=0.302 ms
64 bytes from icmp_seq=18 ttl=128 time=0.509 ms
64 bytes from icmp_seq=19 ttl=128 time=0.570 ms
64 bytes from icmp_seq=20 ttl=128 time=0.211 ms ^?^C
--- ping statistics ---
40 packets transmitted, 8 received, 80% packet loss, time 39100ms rtt
min/avg/max/mdev = 0.211/0.340/0.570/0.120 ms

Example of Host Unreachable

user@user-desktop:~$ ping
PING ( 56(84) bytes of data.
From icmp_seq=1 Destination Host Unreachable
From icmp_seq=2 Destination Host Unreachable
From icmp_seq=3 Destination Host Unreachable
From icmp_seq=4 Destination Host Unreachable
From icmp_seq=5 Destination Host Unreachable
From icmp_seq=6 Destination Host Unreachable
From icmp_seq=7 Destination Host Unreachable
From icmp_seq=8 Destination Host Unreachable
From icmp_seq=9 Destination Host Unreachable
From icmp_seq=10 Destination Host Unreachable
From icmp_seq=11 Destination Host Unreachable
From icmp_seq=12 Destination Host Unreachable
--- ping statistics ---
13 packets transmitted, 0 received, +12 errors, 100% packet loss, time 12051ms

Network Information

user@user-desktop:~$ ifconfig
eth0  Link encap:Ethernet  HWaddr 78:ac:c0:bb:67:d4 
      inet addr:  Bcast: Mask:
      inet6 addr: fe80::7aac:c0ff:febb:67d4/64 Scope:Link
      RX packets:240643 errors:0 dropped:0 overruns:0 frame:0
      TX packets:223734 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:25537053 (25.5 MB)  TX bytes:17135945 (17.1 MB)
      Interrupt:19 Memory:f0100000-f0120000

lo    Link encap:Local Loopback 
      inet addr:  Mask:
      inet6 addr: ::1/128 Scope:Host
      UP LOOPBACK RUNNING  MTU:65536  Metric:1
      RX packets:478 errors:0 dropped:0 overruns:0 frame:0
      TX packets:478 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0
      RX bytes:67030 (67.0 KB)  TX bytes:67030 (67.0 KB)
share|improve this question

If you use wifi with Wireless Router,I suggest you to change the Wireless Router's wireless channel to another unusual one. because the NIC driver of Ubuntu is imperfect

share|improve this answer
The problem is on Ethernet... not on wifi – rizwan Apr 29 '14 at 9:10

I'm seeing the same behavior. Solid connectivity while running 13.10 and previous builds. Clean install of 14.4 and internet is very sporadic.

I did find that if I set up a continuous ping, I am able to browse somewhat reliably and the connection stays active. Without the ping, it behaves as if the wireless shuts down completely until the next data request, then it has to renegotiate connection, creating severe lag.

In fact without the ping, I couldn't even run an apt-get update.

Not quite a solution, but it's helping me limp along until I can find an actual solution.

share|improve this answer
Russ Yes you are absolutely right. If ping is continuous, browsing behaves rightly. – rizwan May 6 '14 at 7:38

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.