Home / server / Questions / 272087
Accepted
ujjain
Asked: 2011-05-21 14:46:21 +0800 CST

How come restarting networking does not work on Debian?

  • 772

How come restarting networking does not restart eth0 successfully on my server? None of my CentOS virtual machines have this problem.

root@living:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:91:00:01
          inet addr:192.168.1.110  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fe91:1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9354 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4835 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1052796 (1.0 MiB)  TX bytes:1129902 (1.0 MiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:287 errors:0 dropped:0 overruns:0 frame:0
          TX packets:287 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:23280 (22.7 KiB)  TX bytes:23280 (22.7 KiB)
root@living:~# service networking restart
Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces ... (warning).
Reconfiguring network interfaces...
[PuTTY disconnects]
root@living:~# ifconfig
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:287 errors:0 dropped:0 overruns:0 frame:0
          TX packets:287 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:23280 (22.7 KiB)  TX bytes:23280 (22.7 KiB)
networking debian

2 Answers

  1. Best Answer
    root@machine:~# cat /etc/network/interfaces
# 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

# The primary network interface
allow-hotplug eth0
iface eth0 inet static
 address 192.168.1.110
 gateway 192.168.1.1
 netmask 255.255.255.0
 network 192.168.1.0
 broadcast 192.168.1.255

    The solution was replacing allow-hotplug by auto. Thanks! :)

    • 5

  2. I suspect your problem is that when networking is shut down (to restart), sshd is noticing and closing the connection. When sshd closes the connection, the pseudo-tty SIGHUPs the shell, along with the programs that were running in it. This includes init.d/networking which is dying before it can start the connection back up again.

    Try running screen first (so that the shell is not interrupted) or at least nohup service networking restart so that the script won't receive SIGHUP and terminate.

    • 2