Help with making network diagram

February 24, 2009 at 02:08:57
Specs: Windows XP
I am trying to build a network diagram including the ISP side(DNS and File servers at least, i think) and a home LAN with 2 PCs or so on it, on it and obviously the internet inbetween. The internet part can be pretty basic as obvioulsy it is massively complex but a realistic ISP and Home LAN should be doable.

I want the PCs on the LAN to be assigned IPs via DHCP so i need to know where the DHCP server goes, i thought it went at the ISP side but the ISP can't assign private IPs to a home LAN right, wouldn't make sense, but then the ISP must have a DHCP server to assign the internet IP to the LAN??

So i need to improve on my current attempt and make it as realistic as possible, which means adding relavent IPs / hardware / DHCP servers, DNS servers, etc...

Here is what i have so far. I know this is a pretty useless, highly basic attempt but i want to work on it and improve on it.

Can anyone help?

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February 24, 2009 at 07:49:45
Your DHCP server will need to be within the LAN so that LAN clients can contact it.

Yes, your ISP will have it's own DHCP server to dish out IP's to clients (you know, people like you) and probably also internal staff members PC's. This has nothing to do with your LAN however. Your LAN is a separate entity residing behind your firewall/router/NAT device (likely a SOHO router).

As far as the diagram goes, you really only want to detail your LAN. Your providers is not yours and you're not likely to get any details on it from them either even if you asked. As a rule of thumb, I stop at the providers "cloud".

With my network diagrams I do detail the providers equipment that resides in my LAN. Which is to say, their edge device. I also show the IP on our interface of said equipment (In our case, the one external connection is via the providers Cisco router. With our other external connection we have edge devices that are Nortel switches which connect to the providers edge devices which are Cisco switches).

I do know the IP's of our side of their devices, the other side is the "cloud" and I don't worry about it. Getting traffic from A to B beyond that point is their problem, not mine.

From what I see, your diagram looks good except for the attempt at too much detail with regard to the provider's equipment.

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February 24, 2009 at 08:39:13
I would seriously listen to Curt R but if you want a wider opinion try the following homepage for ...

Rate My Network Diagram!

Bear in mind that since I haven't tried this site I cannot vouch for them.


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February 24, 2009 at 09:03:54
XpUser, from a brief look that site maybe exactly what i was looking for thanks.

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