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I have a lot of network problems since I made the upgrade to the 11.10

In our company, We have 3 computers upgraded to the 11.10. Every one of this have network problems. The other computers are under Ubutun 11.04 ands works fine.

The network problem are not constants, sometimes after a reboot it's working. But if there are a problem I stay since a reboot. For example we have :

  • Connection troubles : streaming music does not work more than 30s, a lot of AJAX request does not work.
  • Error on requesting a webpage, the browser (firefox, chromium) doesn't find the hosts
  • Error often on requesting a webpage for a /etc/hosts host
  • Error on ssh or scp, display the message : no root to host
  • Error on svn.

We already tried :

  • Desactivate IP v6
  • Install Wicd instead of "Network Manager"
  • Replace the /etc/resolv.conf by static data
  • etc.

Is somebody have an idea ?

Thanks a lot !

See you, Thomas.

[Edit] Add some hard ware informations

sudo lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation 82P965/G965 Memory Controller Hub [8086:29a0] (rev 02)
00:01.0 PCI bridge [0604]: Intel Corporation 82P965/G965 PCI Express Root Port [8086:29a1] (rev 02)
00:02.0 VGA compatible controller [0300]: Intel Corporation 82G965 Integrated Graphics Controller [8086:29a2] (rev 02)
00:02.1 Display controller [0380]: Intel Corporation 82G965 Integrated Graphics Controller [8086:29a3] (rev 02)
00:19.0 Ethernet controller [0200]: Intel Corporation 82562V 10/100 Network Connection [8086:104c] (rev 02)
00:1a.0 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 [8086:2834] (rev 02)
00:1a.1 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 [8086:2835] (rev 02)
00:1a.7 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 [8086:283a] (rev 02)
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio Controller [8086:284b] (rev 02)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 [8086:283f] (rev 02)
00:1d.0 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 [8086:2830] (rev 02)
00:1d.1 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 [8086:2831] (rev 02)
00:1d.2 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 [8086:2832] (rev 02)
00:1d.7 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 [8086:2836] (rev 02)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e] (rev f2)
00:1f.0 ISA bridge [0601]: Intel Corporation 82801HH (ICH8DH) LPC Interface Controller [8086:2812] (rev 02)
00:1f.2 RAID bus controller [0104]: Intel Corporation 82801 SATA RAID Controller [8086:2822] (rev 02)
00:1f.3 SMBus [0c05]: Intel Corporation 82801H (ICH8 Family) SMBus Controller [8086:283e] (rev 02)

--

sudo lshw -class network
  *-network               
       description: Ethernet interface
       product: 82562V 10/100 Network Connection
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: eth0
       version: 02
       serial: 00:19:d1:47:e4:da
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.3.10-k2 duplex=full firmware=1.1-2 ip=192.168.2.166 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:42 memory:dfde0000-dfdfffff memory:dfddb000-dfddbfff ioport:ecc0(size=32)
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  • Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information? Oct 24, 2011 at 17:24
  • Try this DNS configuration
    – 414v32
    Oct 26, 2011 at 1:31
  • Thanks José for your help. but it's not working.
    – Thomas
    Oct 28, 2011 at 13:13

2 Answers 2

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It seems to be a Linux kernel bug.
We roll back to the 2.6.38 and everything is fine again.
To do that, we just installed Grub Customizer [French link]

Also it should be possible to remove old unused Linux Kernel Headers like this [English link]

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I have news about our network problem.
It's seems to be an icmp-redirect bug with Linux kernel >= 3.0.0
The kernel adds entries in the ARP table from ICMP redirect message and should not.

The solution is :

  1. Edit /etc/sysctl.conf to add :
    net.ipv4.conf.all.accept_redirects=0
    net.ipv4.conf.default.accept_redirects=0
  2. Reboot

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