Debian Configuration :: No Internet Connection After Reboot

Feb 20, 2016

I rebooted my vServer (Debian 8) and it doesn't came back up. Well, I used the rescue console on my server and the server seems to be running fine, except the network was broken. So I tried 'ifconfig' but nothing came up. So I tried to enable my interface with 'ifconfig venet0 up', and now it appears in my ifconfig list

Code: Select allroot@i67svof:/var/www# ifconfig
venet0    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 
          UP BROADCAST POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1
          RX packets:557 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:36463 (35.6 KiB)  TX bytes:0 (0.0 B)

My HWaddr doesn't look that well :) 'ip addr' prints this result:

Code: Select allroot@i67svof:/var/www# ip addr
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: venet0: <BROADCAST,POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN

These are the last lines in /var/log/syslog:

Code: Select allroot@i67svof:/var/www# tail /var/log/syslog
Feb 20 11:34:16 i67svof systemd[1]: Stopping memcached daemon...
Feb 20 11:34:16 i67svof systemd[1]: Stopping Network Name Resolution...
Feb 20 11:34:16 i67svof systemd[1]: Stopping Regular background program processing daemon...
Feb 20 11:34:16 i67svof systemd[1]: Stopping Login Prompts.

[Code] .....

And finally my network config in /etc/network/interfaces

Code: Select all# Auto generated lo interface
auto lo
iface lo inet loopback
# Auto generated venet0 interface
auto venet0

[Code] .....

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Debian :: Can't Get Wired Internet Connection After Reboot

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I have been using this fresh Debian 8.2 install for 3 days without any network problems.

What I did this morning :

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Thats when I noticed that my connection was down.

I verified all the physical layer. My laptop has access to the internet tried to connect on an another router with eht0, changed the wire, nothing worked.

It seems like the interface can't get a dhcp ipv4 address even when I try to force is with dhclient, I get no offer when my laptop works just fine.

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[code]....

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07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)

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[ 1.414250] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
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[ 13.813496] Bluetooth: BNEP (Ethernet Emulation) ver 1.3

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# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback

[Code].....

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Jan 14, 2016

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After I set-up the array, lsblk shows:

Code: Select allsimon@debian-server:~$ lsblk
NAME                          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                             8:0    0 931.5G  0 disk
`-sda1                          8:1    0 931.5G  0 part
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sdb                             8:16   0 931.5G  0 disk

[Code] ....

After a reboot, lsblk shows:

Code: Select allsimon@debian-server:~$ lsblk
NAME                          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                             8:0    0 931.5G  0 disk
`-sda1                          8:1    0 931.5G  0 part
  `-md0                         9:0    0 931.4G  0 raid1
    |-md0p1                   259:0    0 811.6G  0 md

[Code] ...

I don't know where the md0p1 and md0p2 partitions are coming from. My /etc/fstab and /etc/mdadm/mdadm.conf both have nothing about this in them.

parted shows one partition on md0:

Code: Select allsimon@debian-server:~$ sudo parted /dev/md0 print
Model: Linux Software RAID Array (md)
Disk /dev/md0: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: loop
Disk Flags:
Number  Start  End     Size    File system  Flags
 1      0.00B  1000GB  1000GB  ntfs

Where the md0p1 and md0p2 partitions are coming from?

I'm setting up the array by doing as follows:

Delete existing device (I've done this a few times):

Code: Select allsudo mdadm --stop /dev/md0
sudo mdadm --remove /dev/md0

Zero drives:

Code: Select allsudo dd if=/dev/zero of=/dev/sda bs=1M count=1024
sudo dd if=/dev/zero of=/dev/sdb bs=1M count=1024

Create partition tables:

Code: Select allsudo parted /dev/sda mklabel gpt
sudo parted /dev/sdb mklabel gpt

Create full-disk partitions:
Code: Select allsudo parted -a optimal /dev/sda mkpart primary '0%' '100%'
sudo parted -a optimal /dev/sdb mkpart primary '0%' '100%'

Set raid flag on partitions:

Code: Select allsudo parted /dev/sda set 1 raid on
sudo parted /dev/sdb set 1 raid on

Create RAID array:

Code: Select allsudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sd[ab]1

Add filesystem (I'm using NTFS, but the problem also happens with ext4)

Code: Select allsudo mkfs.ntfs -f /dev/md0

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I've been using various distros of Linux for over 20 years - but I'm stumped.

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It all LOOKS right, but ping can't get off the box "destination unreachable", and no other system on the LAN can ping it.

I'm amazed a basic static IPV4 network setup completely breaks it. This is my main workstation - a dual-boot system where Windows runs fine - so it's not hardware.

EDIT: This has been solved. See the solution post: [URL]

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Here is some more information:

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[code]....

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The Laptop is a Samsung R510-Aura T3200 Delfina with the following Hardware and Setup (using Grub as boot loader):

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- NVIDIA GeForce 9200M GS
- 3GB RAM + 1GB reserved for GeForce
- Konfiguration Details:
-- Phoenix Bios

[Code]....

Maybe a strange BIOS-Setting that works with the 32bit kernels but not with the 64bit kernel? I've seen a post on here that indicates someone is running the amd64 kernel on a T3200 successfully, and the chip is definitely 64bit capable, so the reboot behavior is a complete mystery for me

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