Switch and router configuration

[muraripadhan]

Dears

I have 5 department

1-HR

2-SALES

3-Customer service

4-IT

5-Planning Department

My IP class is B and my range is 172.141.0.0/16

My requirement is

I will assign IP for "HR" only 172.141.10.0/16 range

IP for "SALES" only 172.141.20.0/16 range

IP for "Customer Department" only 172.141.30.0/16 range

IP for "IT" only 172.141.40.0/16 range

IP for "Planning Department" only 172.141.50.0/16 range

And If someone give IP on HR with different range like 172.141.60.0/16 then it will not work

I want to assign specific range of IP for specific Department.

How i will configure

Please suggest me and give config file.

Thanks & Regards

Murari Mohan Padhan

[Julio E. Moisa · Accepted solution]

Hi,

You need to use VLSM in order to provide proper amount of hosts per subnet, or you could assign a /24 for each department, but you could waste IP addresses. May I know the amount of required hosts per department?

Attached you will find a VLSM file that could be useful.

:-)

[Deepthi]

Hi Murari,

1. The IP segment you selected is not a private IP segment. So, need to use one of these IPs for your internal corp. usage.

     10.0.0.0        -   10.255.255.255  (10/8 prefix)
     172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
     192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

https://tools.ietf.org/html/rfc1918

2. You cannot get  /16 subnet from a /16 network. So, you would need to go for more small subnets. I suggest you to use VLSM techniques for this.

http://www.aboutmyip.com/AboutMyXApp/SubnetCalculator.jsp

-Hope these information helps...

Have a good time..

[muraripadhan]

But we are using this network in our LAN...since 15 years

[Deepthi]

Hi Murari,

I am not pretty much sure why your corp. are using those IP addresses, but as per the industry standards, those are not the recommendations. 

Those are the public IPs used by AOL Inc. if am not wrong according to my search.

IP Address	172.141.0.0
Location	United States, Virginia, Dulles
Latitude & Longitude of City	38.997708, -77.433179 (38°59'52"N   77°25'59"W)
ISP	AOL Inc.

So, maybe I am guessing that you are using those IPs internally without routing it to the open internet.

Even with you set up, you cannot get 172.141.10.1/16 segment from another 172.141.0.1/16 segment as i already informed. 

The segment 172.141.0.1/16 involves all the IPs from 172.141.0.1 to 172.141.255.255 and so your requirement of subnetting would be wrong in this case.

So, you may go for smaller subnets such as 172.141.10.1/24, 172.141.20.1/24, 172.141.30.1/24 and so on which can be accommodated within your 172.141.0.1/16 subnet.

Results

Address:	172.141.0.0	10101100.10001101.00000000.00000000
Netmask:	255.255.0.0	11111111.11111111.00000000.00000000
Wildcard:	0.0.255.255	00000000.00000000.11111111.11111111
Network Address:	172.141.0.0 / 16	10101100.10001101.00000000.00000000
Broadcast Address:	172.141.255.255	10101100.10001101.11111111.11111111
First host:	172.141.0.1	10101100.10001101.00000000.00000001
Last host:	172.141.255.254	10101100.10001101.11111111.11111110
Total host count:	65534

[muraripadhan]

Yes we are not routing in open internet it is using internally