CentOS Networking with V Box

Tue Feb 3 22:48:54 MST 2015

OK, just conected directly to my router and restarted my network script on
the Linux server....still no IPv4 connection.

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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