Re: CentOS Networking with V Box

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Author: Michael Torres
Date:  
To: Main PLUG discussion list
Subject: Re: CentOS Networking with V Box
here is my lo file

DEVICE=lo
IPADDR=127.0.0.1
NETMASK=255.0.0.0
NETWORK=127.0.0.0
#If you are having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback


I dont know what "this" is referring to "NETWORK" or "BROADCAST"

Ill try BROADCAST first....


On Wed, Feb 4, 2015 at 12:22 AM, Kevin Fries <> wrote:

> Ok, here is what I see.
>
> Your interface appears to be trying to do a DHCP configure. But, here is
> your problem... the adapter already had one... and Windows got it. You are
> in Bridge, not NAT mode, so Linux can not have its own IP, it will get
> rejected by the host server.
>
> Let me think a sec on this.
>
> Kevin
> On Feb 4, 2015 12:16 AM, "Michael Torres" <> wrote:
>
>> ...devserver NetworkManager[561]: <warn> (enp0s3): DHCPv4 request timed
>> out.
>> ...devserver NetworkManager[561]: <info> (enp0s3): canceled DHCP
>> transaction, DHCP client pid 2138
>> ...devserver NetworkManager[561]: <info> Activation (enp0s3) Stage 4 0f 5
>> (IPv4 Configure Timeout) scheduled...
>> ...devserver NetworkManager[561]: <info> Activation (enp0s3) Stage 4 0f 5
>> (IPv4 Configure Timeout) started...
>> ...devserver NetworkManager[561]: <info> Activation (enp0s3) Stage 4 0f 5
>> (IPv4 Configure Timeout) complete...
>> ...devserver network[1987]: Bringing up interface enp0s3: Error: Timeout
>> 90 sec expired.
>> ...devserver network[1987]: [FAILED]
>> ...devserver systemd[1]: network.service: control process exoited,
>> code=exited satus=1
>> ...devserver systemd[1]: Failed to start LSB: Bring up/down networking.
>> -- Subject: Unit network.service has failed
>> -- Defined-By: systemd
>> -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
>> --
>> -- Unit network.service has failed
>>
>>
>> This may show the problem, but it shows what I already know. I went to
>> that site "freedesktop" and search for key words that were in this
>> error......, nothing.
>>
>> So, if this erorrs tells you something that I cannot readily see, I am
>> all ears (or eyes, as this is email...)
>>
>> On Wed, Feb 4, 2015 at 12:00 AM, Kevin Fries <>
>> wrote:
>>
>>> Bingo, Huston we found the problem.
>>>
>>> The old scripts are using systemctl so for backwards compatability.
>>> Look in the journal and it should tell you what is wrong.
>>>
>>> I think the command off the top of my head is something like
>>>
>>> #journalctl --unit=network
>>>
>>> Kevin
>>> On Feb 3, 2015 11:53 PM, "Michael Torres" <> wrote:
>>>
>>>> OK, when I start/stop the network service, I use the following
>>>> command....
>>>>
>>>> [root@devserver]# /etc/init.d/network stop
>>>>     Stopping network (via systemctrl)

>>>>
>>>>
>>>> [root@devserver]# /etc/init.d/network start
>>>>     Starting network (via systemctrl)

>>>>
>>>> Then I run the commands that you gave earlier after starting fails...
>>>>
>>>>
>>>> This is the result..
>>>>
>>>> network.service loaded failed failed LSB: Bring up/down networking
>>>>
>>>>
>>>>
>>>>
>>>> On Tue, Feb 3, 2015 at 11:47 PM, Kevin Fries <>
>>>> wrote:
>>>>
>>>>> If your interface has no IP, you can't communicate out to anywhere,
>>>>> and we are back to the conversation about starting and enabling your
>>>>> network service.
>>>>> On Feb 3, 2015 11:45 PM, "Michael Torres" <>
>>>>> wrote:
>>>>>
>>>>>> thats the point.... I dont have an IP address...there is nothing that
>>>>>> I put to scan it. My NIC was allowing it when I was at Starbucks.. That
>>>>>> is why I think its my router, as such isnt the router that assigns IP
>>>>>> address to the network when using DHCP?
>>>>>>
>>>>>> On Tue, Feb 3, 2015 at 11:39 PM, Kevin Fries <>
>>>>>> wrote:
>>>>>>
>>>>>>> Ok, down to two possibilities.
>>>>>>>
>>>>>>> Nmap is a scanner. It is trying to identify your VM and probe for
>>>>>>> open ports.
>>>>>>>
>>>>>>> When you scanned by name... it did not understand that name. Your
>>>>>>> router is external to all of this, and should not be involved at all.
>>>>>>>
>>>>>>> Try nmap by IP address.
>>>>>>>
>>>>>>> If that still results in nothing, add a virtual network via VMware
>>>>>>> or VBox. Next add a new virtual network adapter to your VM, and connect it
>>>>>>> to the new network. This should be a private network between host and
>>>>>>> client. Config your interface in the VM. This will resolve your problem.
>>>>>>> In this case, your NIC is not allowing traffic to go out, then back in to
>>>>>>> itself. The traffic is almost certainly not going to your router then back.
>>>>>>>
>>>>>>> HTH
>>>>>>> Kevin
>>>>>>> On Feb 3, 2015 10:41 PM, "Michael Torres" <>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> netstat -plant
>>>>>>>>
>>>>>>>> liastening on ports 25 and 22 both for IPv4 nad IPv6
>>>>>>>>
>>>>>>>> Result from the nmap(windows version)
>>>>>>>> Starting Nmap 6.47 ( http://nmap.org ) at 2015-02-03 22:36 US
>>>>>>>> Mountain Standard Time
>>>>>>>>
>>>>>>>> NSE: Loaded 118 scripts for scanning.
>>>>>>>>
>>>>>>>> NSE: Script Pre-scanning.
>>>>>>>>
>>>>>>>> NSE: Script Post-scanning.
>>>>>>>>
>>>>>>>> Read data files from: C:\Program Files (x86)\Nmap
>>>>>>>>
>>>>>>>> Nmap done: 0 IP addresses (0 hosts up) scanned in 4.20 seconds
>>>>>>>>
>>>>>>>>            Raw packets sent: 0 (0B) | Rcvd: 0 (0B)

>>>>>>>>
>>>>>>>> Failed to resolve "devserver".
>>>>>>>>
>>>>>>>> WARNING: No targets were specified, so 0 hosts scanned.
>>>>>>>>
>>>>>>>> I would ahave asusmed the the above results as the dhcp server is
>>>>>>>> not generating a IPv4 address
>>>>>>>>
>>>>>>>>
>>>>>>>> so...
>>>>>>>>
>>>>>>>> 1) The netstat does not show the binding to port 21... this means
>>>>>>>> SSHD did not start.
>>>>>>>>
>>>>>>>> I am guessing port 22 is OK
>>>>>>>>
>>>>>>>> 2) netstat shows SSHD, but the firewall is not allowing it. Open
>>>>>>>> the firewall
>>>>>>>>
>>>>>>>> Firewall is already disabled
>>>>>>>>
>>>>>>>> 3) netstat shows SSHD, the firewall is open, but you still don't
>>>>>>>> see the port open via nmap.
>>>>>>>>
>>>>>>>>     3a) if you see other ports open, I would look at the Windows
>>>>>>>> firewall

>>>>>>>>
>>>>>>>> Windows firewall allowed it on a Public network (startbuck), so why
>>>>>>>> not allow it at my home
>>>>>>>>
>>>>>>>>     3b) If you don't see any ports open, you have two options here.

>>>>>>>>
>>>>>>>>        3b1) Make sure your NIC (from the Windows side) is in
>>>>>>>> promiscuous mode.

>>>>>>>>
>>>>>>>> dont know how to do that.
>>>>>>>>
>>>>>>>>        3b2) If it is already in promiscuous mode, then this may not
>>>>>>>> work in this configuration.  In this case, try adding a private network on
>>>>>>>> a second NIC, and communicate with the VM over that.
>>>>>>>> Ill try to connect to my ethernet adpater and see if that is it,
>>>>>>>> maybe its my wireless adapter....

>>>>>>>>
>>>>>>>> Mike
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, Feb 3, 2015 at 10:22 PM, Kevin Fries <>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Ok, sorry, I misunderstood.
>>>>>>>>>
>>>>>>>>> Nmap could be your friend here. Install it on your Windows
>>>>>>>>> machine. It will install the graphical tool automatically in Windows.
>>>>>>>>> Point this at your VM, and do a "intense scan"
>>>>>>>>>
>>>>>>>>> Next, on the Linux VM, do a
>>>>>>>>> # netstat -plant
>>>>>>>>>
>>>>>>>>> Zenmap/Nmap will tell you what ports it can see open from its side
>>>>>>>>> of the link. The netstat command will tell you which ports are opened by
>>>>>>>>> running software.
>>>>>>>>>
>>>>>>>>> Lastly, on the Linux VM, do a
>>>>>>>>>    # ip tables -L

>>>>>>>>>
>>>>>>>>> This will tell you which ports the firewall will allow.
>>>>>>>>>
>>>>>>>>> Now, you have a few possibilities:
>>>>>>>>>
>>>>>>>>> 1) The netstat does not show the binding to port 21... this
>>>>>>>>> means SSHD did not start.
>>>>>>>>>
>>>>>>>>> 2) netstat shows SSHD, but the firewall is not allowing it.
>>>>>>>>> Open the firewall
>>>>>>>>>
>>>>>>>>> 3) netstat shows SSHD, the firewall is open, but you still don't
>>>>>>>>> see the port open via nmap.
>>>>>>>>>
>>>>>>>>>     3a) if you see other ports open, I would look at the Windows
>>>>>>>>> firewall

>>>>>>>>>
>>>>>>>>>     3b) If you don't see any ports open, you have two options here.

>>>>>>>>>
>>>>>>>>>        3b1) Make sure your NIC (from the Windows side) is in
>>>>>>>>> promiscuous mode.

>>>>>>>>>
>>>>>>>>>        3b2) If it is already in promiscuous mode, then this may
>>>>>>>>> not work in this configuration.  In this case, try adding a private network
>>>>>>>>> on a second NIC, and communicate with the VM over that.

>>>>>>>>>
>>>>>>>>> Let me how it goes.
>>>>>>>>>
>>>>>>>>> Kevin
>>>>>>>>> On Feb 3, 2015 9:58 PM, "Michael Torres" <>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Well, no, I didnt issue any commands other than
>>>>>>>>>> /path/to/network/script/network start /path/to/network/script/network stop
>>>>>>>>>> and the commands to disable firewall/SELINUX
>>>>>>>>>>
>>>>>>>>>> I know I didnt use any systemctrl commands., but I tried to run
>>>>>>>>>> the commands that you just provided and nothing happened. I should
>>>>>>>>>> probably say that I know that IPv6 is enalbed and have network connection
>>>>>>>>>> to the net work and I can ping yahoo.com etc..... I just cant
>>>>>>>>>> SSH(putty) to the server.
>>>>>>>>>>
>>>>>>>>>> This all leads me to beleive that there is a configuration in my
>>>>>>>>>> router that is not allowing me to get a IPv4 address. Does the default
>>>>>>>>>> gateway have to be a certain number? I have manually configured that IP on
>>>>>>>>>> my router a long time ago, but even then I had Bridged networking working
>>>>>>>>>> correctly.
>>>>>>>>>>
>>>>>>>>>> Mike
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Tue, Feb 3, 2015 at 9:48 PM, Kevin Fries <
>>>>>>>>>> > wrote:
>>>>>>>>>>
>>>>>>>>>>> Your network is probably not getting started. The enp0p3 is the
>>>>>>>>>>> name of an interface started almost definantly by systemd, not the old
>>>>>>>>>>> RHEL way. This is likely why the networking-scripts didn't work.
>>>>>>>>>>>
>>>>>>>>>>> When you were at Starbucks, you likely did a systemctl start on
>>>>>>>>>>> the interface. Look in your history for it. If you find it, issue the
>>>>>>>>>>> same command again. If your interface comes up correctly, reissue the
>>>>>>>>>>> command once again, substituting enable for start. This second command is
>>>>>>>>>>> similar to a chkconfig command.
>>>>>>>>>>>
>>>>>>>>>>> Let me know how that works.
>>>>>>>>>>>
>>>>>>>>>>> Kevin
>>>>>>>>>>> On Feb 3, 2015 9:13 PM, "Michael Torres" <>
>>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> The result of that command is:
>>>>>>>>>>>>
>>>>>>>>>>>> 0 loaded units listed
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> So I ran a what it suggested: systemctl list-unit-files
>>>>>>>>>>>> majority of everything says "static" but some are "enabled" or
>>>>>>>>>>>> "disabled"
>>>>>>>>>>>>
>>>>>>>>>>>> again, because I cannot copy or capture a screen shot, is
>>>>>>>>>>>> there a specific list item that you need to see?"
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Tue, Feb 3, 2015 at 8:44 PM, Kevin Fries <
>>>>>>>>>>>> > wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> Do a
>>>>>>>>>>>>>
>>>>>>>>>>>>> # systemctl --failed
>>>>>>>>>>>>>
>>>>>>>>>>>>> And post the results
>>>>>>>>>>>>>
>>>>>>>>>>>>> Kevin
>>>>>>>>>>>>> On Feb 3, 2015 8:37 PM, "Michael Torres" <
>>>>>>>>>>>>> > wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> Arrghh....yes its configured. But I am having an issue
>>>>>>>>>>>>>> getting the cat /etc/sysconfig/network-script/ifcfg-enp0s3..........because
>>>>>>>>>>>>>> I cant connect, I cant ssh in to use outty so I can copy using my mouse.
>>>>>>>>>>>>>> I tried taking a screen shot, but VBox for some reason wont display on on
>>>>>>>>>>>>>> the "print screen"command.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> is there a particular setting you are looking for? again,
>>>>>>>>>>>>>> the file is configured and it is reading it.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Mike
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Tue, Feb 3, 2015 at 8:15 PM, Stephen M <
>>>>>>>>>>>>>> > wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I don't remember if this is a problem in centos 7 as it was
>>>>>>>>>>>>>>> in 6. But check to make sure the eth0 is configured. But yes a print out
>>>>>>>>>>>>>>> of ifconfig inside vox would be great.
>>>>>>>>>>>>>>> On Feb 3, 2015 8:07 PM, "Michael Torres" <
>>>>>>>>>>>>>>> > wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Hello all,
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I have an problem that I cannot seem to figure out.....
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I am trying to use "Bridged" networking in Virtual Box to a
>>>>>>>>>>>>>>>> CentOS 7 minimum install distro that I want to use for my development
>>>>>>>>>>>>>>>> server.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I have used Bridged networking in the past and never had
>>>>>>>>>>>>>>>> any issues but that was with older versions of CentOS
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> The issue.... DHCP will not assign a IPv4 address to the
>>>>>>>>>>>>>>>> server.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Here is the weird part... I was at startbucks and actually
>>>>>>>>>>>>>>>> got it to work! (Please, hold the "Just use it at starbucks then"
>>>>>>>>>>>>>>>> comments..I know....)
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Here is the process I used...
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> -Installed a fresh CentOS 7 on VBox
>>>>>>>>>>>>>>>> -While on NAT, I performed "yum update" so my server was
>>>>>>>>>>>>>>>> fresh with the latest
>>>>>>>>>>>>>>>> -Disabled SELinux
>>>>>>>>>>>>>>>> -Disabled the Firewall
>>>>>>>>>>>>>>>> -Shut down server to reconfigure the adapter to "Bridged"
>>>>>>>>>>>>>>>> -used adapter type of "Intel Pro 1000 MT Desktop (82540EM)"
>>>>>>>>>>>>>>>> -set it to "Promiscuous Mode"
>>>>>>>>>>>>>>>> -restart the server
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Again, at Starbucks it assigned a IP address, so this leads
>>>>>>>>>>>>>>>> me to believe that the issue is with a configuration on my router.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I am not very good at networking, so any help would be
>>>>>>>>>>>>>>>> appreciated.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> If you need error messages or other output, let me know
>>>>>>>>>>>>>>>> (and possibly the command as I don't know networking that well other than
>>>>>>>>>>>>>>>> "ifconfig")
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Mike
>>>>>>>>>>>>>>>>
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