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Todd and Margo Chester

2007-Nov-10 06:20 UTC

[CentOS-virt] Virtual Box Host Networking problems

Dear Centos-Virt:

This is actually a second request for help on the
same issue.  I finally got to try what several
months ago was replayed to me and no joy was to
be had.  I am afraid the original thread got stale
and also had extra, unnecessary data in it.

Guest=XP Pro, SP2
Host=CentOS5; # uname -r; 2.6.18-8.1.15.el5

VirtualBox-1.5.0_24069_rhel5-2.i586.rpm
http://www.virtualbox.org/download/1.5.0/VirtualBox-1.5.0_24069_rhel5-1.i586.rpm.run

I have two nic: eth0 is the internal network; eth1 connects to a DSL modem.

I also have a fully functioning DHCP server on eth0 (works perfectly
with Parallels for Linux).

The directions (from hell):
http://www.virtualbox.org/download/UserManual.pdf

I am trying to set up a "host interface" network between
my XP guest and my Linux host (eth0).

I do believe I don't have a clue as to how to set up
a bridge on eth0.  Here is what I have so far:

~~~~~~~~~~~~~~~~~
ifcfg-br0:

DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
BROADCAST=192.168.255.255
IPADDR=192.168.255.10
NETMASK=255.255.255.0
NETWORK=192.168.255.0
GATEWAY=192.168.255.10
ONBOOT=yes
USERCTL=yes
IPV6INIT=no
PEERDNS=no


~~~~~~~~~~~~~~~~~
ifcfg-eth0:

DEVICE=eth0
TYPE=Ethernet
BOOTPROTO=static
BROADCAST=192.168.255.255
IPADDR=192.168.255.12
NETMASK=255.255.255.0
NETWORK=192.168.255.0
GATEWAY=192.168.255.10
ONBOOT=yes
USERCTL=yes
IPV6INIT=no
PEERDNS=no
BRIDGE=br0


~~~~~~~~~~~~~~~~~
ifcfg-vbox0:

DEVICE=vbox0
TYPE=Ethernet
BOOTPROTO=static
BROADCAST=192.168.255.255
IPADDR=192.168.255.14
NETMASK=255.255.255.0
NETWORK=192.168.255.0
GATEWAY=192.168.255.10
ONBOOT=yes
USERCTL=yes
IPV6INIT=no
PEERDNS=no
BRIDGE=br0


When I fire up Virtual Box, my DCHP server
offers it an IP, but I do not see the RX
light flashing on my XP monitor icon in the
far right of the status bar.  VB doesn't
get an IP.  If I configure the VB NIC with
a static address (I tried 192.168.255.20),
again no receive light and the network
won't work.

Also,  I have to "ifdown eth1" and "ifup eth1"
to get the "G" (gateway) to show up on
"netstat -rn".  Otherwise, no surfing the
net with Firefox (Linux version).  Weird.

I am so very confused.  Can someone tell
me what I am doing wrong?

Many thanks,
-T

Todd and Margo Chester

2007-Nov-10 20:18 UTC

head link

[CentOS-virt] Virtual Box Host Networking problems

Todd and Margo Chester wrote:> Dear Centos-Virt:
> 
> This is actually a second request for help on the
> same issue.  I finally got to try what several
> months ago was replayed to me and no joy was to
> be had.  I am afraid the original thread got stale
> and also had extra, unnecessary data in it.
> 
> Guest=XP Pro, SP2
> Host=CentOS5; # uname -r; 2.6.18-8.1.15.el5
> 
> VirtualBox-1.5.0_24069_rhel5-2.i586.rpm
>
http://www.virtualbox.org/download/1.5.0/VirtualBox-1.5.0_24069_rhel5-1.i586.rpm.run
> 
> 
> I have two nic: eth0 is the internal network; eth1 connects to a DSL modem.
> 
> I also have a fully functioning DHCP server on eth0 (works perfectly
> with Parallels for Linux).
> 
> The directions (from hell):
> http://www.virtualbox.org/download/UserManual.pdf
> 
> I am trying to set up a "host interface" network between
> my XP guest and my Linux host (eth0).
> 
> I do believe I don't have a clue as to how to set up
> a bridge on eth0.  Here is what I have so far:
> 
> ~~~~~~~~~~~~~~~~~
> ifcfg-br0:
> 
> DEVICE=br0
> TYPE=Bridge
> BOOTPROTO=static
> BROADCAST=192.168.255.255
> IPADDR=192.168.255.10
> NETMASK=255.255.255.0
> NETWORK=192.168.255.0
> GATEWAY=192.168.255.10
> ONBOOT=yes
> USERCTL=yes
> IPV6INIT=no
> PEERDNS=no
> 
> 
> ~~~~~~~~~~~~~~~~~
> ifcfg-eth0:
> 
> DEVICE=eth0
> TYPE=Ethernet
> BOOTPROTO=static
> BROADCAST=192.168.255.255
> IPADDR=192.168.255.12
> NETMASK=255.255.255.0
> NETWORK=192.168.255.0
> GATEWAY=192.168.255.10
> ONBOOT=yes
> USERCTL=yes
> IPV6INIT=no
> PEERDNS=no
> BRIDGE=br0
> 
> 
> ~~~~~~~~~~~~~~~~~
> ifcfg-vbox0:
> 
> DEVICE=vbox0
> TYPE=Ethernet
> BOOTPROTO=static
> BROADCAST=192.168.255.255
> IPADDR=192.168.255.14
> NETMASK=255.255.255.0
> NETWORK=192.168.255.0
> GATEWAY=192.168.255.10
> ONBOOT=yes
> USERCTL=yes
> IPV6INIT=no
> PEERDNS=no
> BRIDGE=br0
> 
> 
> When I fire up Virtual Box, my DCHP server
> offers it an IP, but I do not see the RX
> light flashing on my XP monitor icon in the
> far right of the status bar.  VB doesn't
> get an IP.  If I configure the VB NIC with
> a static address (I tried 192.168.255.20),
> again no receive light and the network
> won't work.
> 
> Also,  I have to "ifdown eth1" and "ifup eth1"
> to get the "G" (gateway) to show up on
> "netstat -rn".  Otherwise, no surfing the
> net with Firefox (Linux version).  Weird.
> 
> I am so very confused.  Can someone tell
> me what I am doing wrong?
> 
> Many thanks,
> -T
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt
> 
I found a posting over on VB's forums:
 
http://forums.virtualbox.org/viewtopic.php?t=1636&highlight=bridging+host+interface

Here TonyM using the following in his rc.local:

/sbin/modprobe tun
/usr/sbin/brctl addbr br0
/sbin/ifconfig eth0 0.0.0.0 promisc
/usr/sbin/brctl addif br0 eth0
/sbin/ifconfig br0 192.168.1.10 netmask 255.255.255.0
/usr/bin/VBoxAddIF vbox0 oracle br0
/sbin/ifconfig vbox0 192.168.1.50 netmask 255.255.255.0
/sbin/service network restart

(No symptom change for me, so I put everything back
the way it was.  And, I did test it with my firewall
off.)

The Symptom, when starting XP in VB, was that it could
not get an IP address from my Linux Box's DHCP server.
But, in my messages log (tail -f /var/log/messages),
I can see my DHCP server valiantly trying to give it one:

Nov 10 12:04:20 rn1 dhcpd: DHCPDISCOVER from 08:00:27:d2:20:b8 
(vb-winxp) via eth0
Nov 10 12:04:21 rn1 dhcpd: DHCPOFFER on 192.168.255.197 to 
08:00:27:d2:20:b8 (vb-winxp) via eth0
Nov 10 12:04:24 rn1 dhcpd: DHCPDISCOVER from 08:00:27:d2:20:b8 
(vb-winxp) via eth0
Nov 10 12:04:24 rn1 dhcpd: DHCPOFFER on 192.168.255.197 to 
08:00:27:d2:20:b8 (vb-winxp) via eth0
Nov 10 12:04:32 rn1 dhcpd: DHCPDISCOVER from 08:00:27:d2:20:b8 
(vb-winxp) via eth0
Nov 10 12:04:32 rn1 dhcpd: DHCPOFFER on 192.168.255.197 to 
08:00:27:d2:20:b8 (vb-winxp) via eth0
Nov 10 12:04:49 rn1 dhcpd: DHCPDISCOVER from 08:00:27:d2:20:b8 
(vb-winxp) via eth0
Nov 10 12:04:49 rn1 dhcpd: DHCPOFFER on 192.168.255.197 to 
08:00:27:d2:20:b8 (vb-winxp) via eth0

Now this is interesting: the DHCP server is offering the
IP via eth0.  Should it not being offering it via br0 or
vbox0?  (I am afraid I do not understand this bridging so well.)

Question about bridging:  who talks to 127/0/0/1?  br0 or
eth0?  I am thinking that this is the sequence:
    127.0.0.1--> eth0 --> br0 --> vbox0 --> virtual box's nic
Am I correct?

So I am back to the symptom I had before: the VB NIC can
write to the host Linux system, but it can not read.

:'(  :'(   :'(

-T

Todd and Margo Chester

2007-Nov-12 05:33 UTC

head link

[CentOS-virt] Virtual Box Host Networking problems

Todd and Margo Chester wrote:> Dear Centos-Virt:
> 
> This is actually a second request for help on the
> same issue.  I finally got to try what several
> months ago was replayed to me and no joy was to
> be had.  I am afraid the original thread got stale
> and also had extra, unnecessary data in it.
> 
> Guest=XP Pro, SP2
> Host=CentOS5; # uname -r; 2.6.18-8.1.15.el5
> 
> VirtualBox-1.5.0_24069_rhel5-2.i586.rpm
>
http://www.virtualbox.org/download/1.5.0/VirtualBox-1.5.0_24069_rhel5-1.i586.rpm.run
> 
> 
> I have two nic: eth0 is the internal network; eth1 connects to a DSL modem.
> 
> I also have a fully functioning DHCP server on eth0 (works perfectly
> with Parallels for Linux).
> 
> The directions (from hell):
> http://www.virtualbox.org/download/UserManual.pdf
> 
> I am trying to set up a "host interface" network between
> my XP guest and my Linux host (eth0).
I do believe I FINALLY have it figured out.  I wrote myself
the following how to.  Please feel free to clean it up and
make it into an "Official CentOS 5 How To".

The only problem I have left is that the Guest XP can not
browse the Host's Samba server by SMB name (IP works fine)

-T

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

T's CentOS 5 -- Virtual Box "Host Networking" bridge setup:

Note: a lot of this is taken from (with lots of refinements):
       http://www.linuxweblog.com/virtualbox-host-networking


iptables:  after creating br0 at etho's expense, you have to
            change all references to "eth0" in your firewall
            to "br0"

br0: will become the internal interface and have a "Fixed" (static)
      IP address of 192.168.255.10


Support software (required);

    "VBoxAddIF" from Virtual Basic

     bridge-utils:
        yum install bridge-utils
 
ftp://ftp.pbone.net/mirror/ftp.centos.org/5.0/os/i386/CentOS/bridge-utils-1.1-2.i386.rpm


~~~~~~~~~~~~~~ /etc/rc.d/rc.local ~~~~~~~~~~~~~~~

# Set permissions on /dev/net/tun such that Virtual Box can use it
/bin/chmod 0666 /dev/net/tun
/bin/chmod 777 /dev/vboxdrv

# Restart the firewall
/etc/{iamnottellingyou}


~~~ /etc/sysconfig/network-scripts/ifcfg-eth0 ~~~

DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
USERCTL=yes
IPV6INIT=no
PEERDNS=no
BRIDGE=br0
ONBOOT=yes
PROMISC=yes


~~~ /etc/sysconfig/network-scripts/ifcfg-br0 ~~~

DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
BROADCAST=192.168.255.255
IPADDR=192.168.255.10
NETMASK=255.255.255.0
NETWORK=192.168.255.0
GATEWAY=192.168.255.10
ONBOOT=yes
USERCTL=yes
IPV6INIT=no
PEERDNS=no
PROMISC=yes


~~~ /etc/sysconfig/network-scripts/ifcfg-br0 ~~~

IPADDR=0.0.0.0
PROMISC=yes


~~~~~~~~ Initial and permanent setup ~~~~~~~~~~~

#! /bin/bash

# load the tun module
modprobe tunvi
chmod 666 /dev/net/tun

# Create a new bridge and add the interfaces to the bridge.
brctl addbr br0
brctl addif br0 eth0
/usr/bin/VBoxDeleteIF vbox0
/usr/bin/VBoxAddIF vbox0 tony br0
brctl addif br0 vbox0

# Bring up eth0 and vbox0 in promiscuous mode
# Commended out as it should be handles in "network-scripts"
#ifconfig eth0 promisc
#ifconfig vbox0 0.0.0.0 promisc

brctl addif br0 vbox0

# Now reboot (restarting networking doesn't work)
echo "Now reboot.  (I have no idea why)"

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