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rated 0 times [  3] [ 0]  / answers: 1 / hits: 49735  / 2 Years ago, wed, august 24, 2022, 11:24:41

I've been searching the internet for the last 2 hours and can't seem to find a solution to the following problem.



I just installed Xen in a fresh Xubuntu 13.04 and in order to setup the networking, I had to remove network_manager. So, all network configuration is done through /etc/network/interfaces. At least, that's what should happen. However, it seems what I put in there is just being ignored: my xenbr0 interface doesn't get an IPv4 address assigned, there's no default gateway and no nameserver is setup.



Here's what's in the /etc/network/interfaces file:



auto lo

iface lo inet loopback



# There are no IP configurations for eth0, it’s all defined under xenbr0:

#auto eth0



# Static configuration

auto xenbr0

iface xenbr0 inet static

  bridge_ports    eth0

  address         192.168.1.200 # the IP address of the Ethernet port

  broadcast       192.168.1.255

  netmask         255.255.255.0

  gateway         192.168.1.1   # the address of the router

  bridge_stp      off           # disable Spanning Tree Protocol - optional

  bridge_waitport 0             # no delay before a port becomes available - optional, comment out if this gives you troubles

  bridge_fd       0             # no forwarding delay - optional

  dns-nameservers 192.168.1.1


In order to fix my network connection, I run a small "fix" script:



#!/bin/bash

ifconfig xenbr0 192.168.1.200 netmask 255.255.255.0 up

route add default gw 192.168.1.1 xenbr0


I would like to fix at the core though. Right now booting takes at least 1 minute extra, because the system waits for a working network connection.



Edit: I also had to add the following to /etc/resolvconf/resolv.conf.d/base and run sudo resolvconf -u:



nameserver 192.168.1.1


Without this I can only ping IP addresses, no DNS requests get passed through. This is actually what convinced me that the interfaces file is completely ignored.



Edit 2: Doing either sudo restart networking or sudo /etc/init.d/networking restart doesn't do anything.



Edit 3: Some extra info. Here is what ifconfig output should look like (working network/internet connection):



eth0      Link encap:Ethernet  HWaddr 00:1c:c0:77:09:9d  

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:3346 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2903 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:2931429 (2.9 MB)  TX bytes:661616 (661.6 KB)

          Interrupt:20 Memory:e3200000-e3220000 



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:65536  Metric:1

          RX packets:16 errors:0 dropped:0 overruns:0 frame:0

          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:1720 (1.7 KB)  TX bytes:1720 (1.7 KB)



xenbr0    Link encap:Ethernet  HWaddr 00:1c:c0:77:09:9d  

          inet addr:192.168.1.200  Bcast:192.168.1.255  Mask:255.255.255.0

          inet6 addr: fe80::21c:c0ff:fe77:99d/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:3329 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2875 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:2870029 (2.8 MB)  TX bytes:647394 (647.3 KB)


Here is what it looks like right after boot. The only thing missing is the xenbr0 IPv4 address (and the routing/DNS data, but you can't see that in ifconfig's output):



eth0      Link encap:Ethernet  HWaddr 00:1c:c0:77:09:9d  

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0 B)  TX bytes:0 (0 B)



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:65536  Metric:1

          RX packets:16 errors:0 dropped:0 overruns:0 frame:0

          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:0 (0 B)  TX bytes:0 (0 B)



xenbr0    Link encap:Ethernet  HWaddr 00:1c:c0:77:09:9d  

          inet6 addr: fe80::21c:c0ff:fe77:99d/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 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:0 (0 B)  TX bytes:0 (0 B)

More From » networking
 Answers
5

I managed to fix my problem by changing 2 files. First of all, as suggested by Eric Carvalho, I uncommented auto eth0 in /etc/networking/interfaces. (Note that this is quite odd, several tutorials online seem to suggest this shouldn't be required for Xen.)



That by itself did not fix the slow boot though. It seems that on startup it still took a few seconds before the interfaces came up and in the meantime Ubuntu was already stuck in a 60 seconds idle wait. This I fixed by modifying the delay time in /etc/init/failsafe.conf from 60 seconds to 1 second. (I found out about this file through Google, no idea which one it was exactly.)


[#30925] Wednesday, August 24, 2022, 2 Years  [reply] [flag answer]
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