Author Topic: Subnetting help  (Read 1083 times)

mason_ld (OP)

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Subnetting help
« on: September 21, 2016, 06:40:48 PM »
Ok guys, here is the assignment:

FlatSmack Ping Pong Paddle Company has experienced an increase in demand and decided to move to a new facility.  Viewing their existing network as outdated they have contracted you to design the network for the new facility using the information below

The new facility consists of a 25000 square foot manufacturing / warehouse building and a 2 story office building.  The primary demark for the ISP is located in the office building server room.

The office building has a reception area, a conference room and 15 private offices on the first floor.  The second floor is setup as a cubicle farm to accommodate 50 workers.

The local ISP has provided them a range of addresses indicated as 208.200.200.200/29

 

The requirements you have been tasked with are as follows:

Both buildings need to be connected
The manufacturing building has a high concentration of machinery but needs durable connections
The office building needs complete wireless coverage but the workstations must be wired
They need a private address scheme that will allow for future growth
The minimum wired connection speed cannot be below 100mbit and they would prefer 1000mbit
 

Provide a drawing of the network topology that shows the media and equipment used.

The firewall, VPN concentrator and Email server all need external IP addresses.

Using the info provided by the ISP show what the IP address for each would be in the notes for the drawing list what private IP range will be used for the internal clients




Now, I know how to lay everything out with the topology, and I know the the private IP range of addresses will use NAT. I'm just wanting someone to check my subnets. Typically, a /29 mask will give us 8 subnets and 6 nodes/hosts per net, but I can only come up with seven subnets for this scenario, because if I added another, I would be over 255.  Below is what I've come up with. Any help or constructive criticism would be great  ;D

Net ID: 208.200.200.200
Broadcast Address – 208.200.200.207
Host address range: 208.200.200.201 - 208.200.200.206
 
208.200.200.208
Broadcast address 208.200.200.215
Host address range: 208.200.200.209 - 208.200.200.214
 
208.200.200.216
Broadcast address 208.200.200.223
Host address range: 208.200.200.217 - 208.200.200.222
 
208.200.200.224
Broadcast address 208.200.200.231
Host address range: 208.200.200.225 - 208.200.200.230
 
208.200.200.232
Broadcast address 208.200.200.239
Host address range: 208.200.200.233 - 208.200.200.238
 
208.200.200.240
Broadcast address 208.200.200.247
Host address range: 208.200.200.241 - 208.200.200.246
 
208.200.200.248
Broadcast address 208.200.200.255
Host address range: 208.200.200.249 - 208.200.200.254

mason_ld (OP)

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Re: Subnetting help
« Reply #1 on: September 21, 2016, 06:46:37 PM »
Would the next subnet be this?

208.200.201.0
Broadcast: 208.200.201.7
Host address range: 208.200.201.1 208.200.201.6

??

Dieselboy

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Re: Subnetting help
« Reply #2 on: September 22, 2016, 01:10:14 AM »
I think that the question wants you to write it down and draw the subnet mask line. Something like:

208.200.201.0/29 =
208.200.201.0
.0 = 00000000
/29 = 11111|000

128 64 32 16 8 | 4 2 1
0     0    0   0  0 | 0 0 0 = 0 = subnet
0     0    0   0  0 | 0 0 1 = 1
0     0    0   0  0 | 0 1 0 = 2
0     0    0   0  0 | 0 1 1 = 3
.....
0     0    0   0  0 | 1 1 1 = 7 = broadcast

I use this website to check things on a daily basis: http://www.subnet-calculator.com/
in that URL I just ignore the first 3 octets, so the first 3 will say 192.168.0. and then in the last octet I just put my subnet and then do the subnet mask as 255.255.255.248 for a /29

If that's too confusing, use the CIDR calc : http://www.subnet-calculator.com/cidr.php

and then you can put in any address you like :)

but it's just for checking. You wont get full marks for showing only answers.
« Last Edit: September 22, 2016, 01:12:52 AM by Dieselboy »

ristau5741

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Re: Subnetting help
« Reply #3 on: September 22, 2016, 06:29:12 AM »
208.200.200.200/29 gives only 8 IP addresses, 6 usable
ain't no way you'll fit 50 users in that.

You'd need to use some RFC1918 IP address
e.g. 192.168.0.0/24 and subnet from there.

you can't use those additional subnets, possibly the ISP has allocated those subnets to other customers.

And since ISP only gave you 208.200.200.200/29 You can't allocate 208.200.200.208/29 208.200.200.216/29 208.200.200.224/29..... etc for use on your private network.

 



 
:professorcat:

Good, Fast, or Cheap, you can only select 2 of the 3.

RoDDy

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Re: Subnetting help
« Reply #4 on: September 22, 2016, 08:00:40 AM »
The first subnet you worked out is all you have available. That's what the ISP gave you.

Net ID: 208.200.200.200
Broadcast Address – 208.200.200.207
Host address range: 208.200.200.201 - 208.200.200.206

I would start by drawing out a diagram with all of the components you need for your network (Firewall, switches, routers servers etc.) for each department and assign private and public addresses to those that need them as mentioned in your question.

deanwebb

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Re: Subnetting help
« Reply #5 on: September 22, 2016, 10:05:11 AM »
The ISP range is only for the Internet connection. Reserve it for the WAN router.

Inside the company, Ristau is correct. You want to use private address spaces, which would be inside the 10.0.0.0/8 range, the 172.16.0.0/12 range, and the 192.168.0.0/16 range. You get to pick, but I would also recommend keeping things as tight as possible. Sure, you could make all the office guys use 10.0.0.0 /8, but it would be better to find a network between 30 and 62 hosts in size to support them...
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