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Old 11-02-2015, 12:13 PM   #1
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Registered: Oct 2015
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Post Networking For A Noob - How to setup LAN/VLAN


I have asked this question in more than one place to get a variety of answers so I can best understand:

I know a fair about computer systems and administration, one thing I have always stayed away from is networking. I think because it's hard to find places that explain it in an easy to understand way that actually makes sense and includes terminology that I can understand without spending hours having to look that up too.

What I'm trying to achieve:

I have two things I want to understand/scenarios:

NB: All VM's reside on citrix xenserver.

I have a linux CentOS VM on my dedicated server, it has a public ipv4 ip. I want to assign this VM a internal ip as I have other vm's on the same server, and want them to be able to communicate/network. Apparently this is done with NAT/bridging. From what I can understand NAT is the process of the firewall essentially translating/redirecting the traffic to whatever port designated. Bridging is like plugging your vm into a real switch.

I don't know if the above definitions are correct, but a explanation of if they are and examples/more definitions would be very much appreciated so I can get my head around it! What's the main advantages/disadvantages to either?

All the tutorials I've come across so far, mention that I would need to install a dns server locally (bind) , is this true? Why? What exactly would I need to do?

Summary: Basically, I want to learn this basic networking so I can have an internal network. (Would this be called a VLAN?) that also has internet connectivity. I also understand that doing this reduces the need for so many ipv4 addresses, further explanation would be appreciated.

Also would it be easier with static ip's, or by installing a DHCP server? (Never used one for linux)

My primary goal is to have internet connectivity inbetween all these vm's aswell as local connectivity between them as an internal network. I have no real idea of how to achieve this.

Scenario #2: All of these vm's reside on ctirix xenserver, so even if I do all this, how am I supposed to get it to work with citrix xenserver. So how would I VLAN? (If that's the correct terminology) If anyone knows could you not only give me the steps, but also explain WHY, that way I'll actually learn.

I've always found networking very confusing, and I do specialise in certain areas for my personal stuff in system administration, but networking I've always managed to avoid delving into too much.

Thank you all for your help!
Old 11-02-2015, 02:24 PM   #2
Registered: Sep 2015
Location: Tilburg, NL
Distribution: Slackware current
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scenario 1: use static ip's and just try! start bind and see what it does.

scenario 2: sorry, you're on your own here.

when looking for help, pay special attention to freebsd forums.
Old 11-02-2015, 07:05 PM   #3
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VLAN is something else. What you are setting up is a virtual network, that is a network without cables and physical interfaces and switches. VLAN on the other hand is a method to have several distinct Ethernet networks on the same physical Ethernet, aka segmentation.

Your question is too large for a forum post, but there is a lot of information out there. I don't know if xenserver uses libvirt (libvirt was originally written for Xen), but at least the concepts should be easily transferrable to your environment. Start at the libvirt wiki,, in particular the first link to When you have specific questions, come back here.
Old 11-03-2015, 05:17 AM   #4
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Registered: Apr 2007
Location: Milton Keynes UK
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Hi Try a facebook page called HowToNetwork, it's all about networking, and there are lots of people who can help on the network site of you problem


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