CentOS Networking with V Box
Kevin Fries
kevin at fries-biro.com
Wed Feb 4 00:00:09 MST 2015
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" <matorres124 at gmail.com> wrote:
> OK, when I start/stop the network service, I use the following command....
>
> [root at devserver]# /etc/init.d/network stop
> Stopping network (via systemctrl)
>
>
> [root at 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 <kevin at fries-biro.com> 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" <matorres124 at gmail.com> 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 <kevin at fries-biro.com>
>>> 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" <matorres124 at gmail.com>
>>>> 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 <kevin at fries-biro.com>
>>>>> 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" <matorres124 at gmail.com>
>>>>>> 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 <kevin at fries-biro.com>
>>>>>>> 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" <matorres124 at gmail.com>
>>>>>>>> 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 <kevin at fries-biro.com>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Do a
>>>>>>>>>>
>>>>>>>>>> # systemctl --failed
>>>>>>>>>>
>>>>>>>>>> And post the results
>>>>>>>>>>
>>>>>>>>>> Kevin
>>>>>>>>>> On Feb 3, 2015 8:37 PM, "Michael Torres" <matorres124 at gmail.com>
>>>>>>>>>> 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 <smelheim85 at gmail.com>
>>>>>>>>>>> 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" <matorres124 at gmail.com>
>>>>>>>>>>>> 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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