RE: Addressing Scheme

[scott_mchale]

Guys,

Please help!!!

I have been asked to design an addressing scheme that will support 930 users. The design must allow for 30% growth, so if my calculations are correct this would take us to 1209.

Glasgow Office:

50 Warehouse Staff

150 Customer services

100 Finance

Total 300 (still to add 30%)

Birmingham office

75 Warehouse staff

100 Customer services

75 Finance

Total: 250 (still to add 30%)

Five regional sites

Aberdeen 20 staff

Newcastle 40 staff

Liverpool 20

Bristol 20

london 30 staff

Total 250 (still to add 30%

each region also has a number (up to 5) of smaller branch sites with less than 10 staff each.

The company leases a range of class C networks of public IP addresses from its main ISP.

I am trying to find a suitable Network address that will support this.

Many thanks

Scott

[Danilo Dy]

Hi,

Did they give you a range of IP Address to use and subnet?

If not, this means you have a free hand on the ip address assignment. Use some coding in the second and third octet to identify the site and department.

Regards,

Dandy

[scott_mchale]

Hi Dandy,

No range of IP addresses or subnets given.

Not sure what you mean by "coding in the second and third octet to identify the site and department."

Seem to be hitting a wall everytime when using VLSM.

what Network Address should I use.

Regards

Scott

[scott_mchale]

Hi Dandy

Cant see your reply, even though I received an email to advise one had been posted.

Scott

[scott_mchale]

Hi Dandy

Cant see your reply, even though I received an email to advise one had been posted.

Scott

[Danilo Dy]

Hi,

This means you have a free hand on the ip address range, you don't have to worry about giving the exact requirement. For example, you can give each site/department a /24 (or 255.255.255.0 network mask).

Coding example is the current International Telephone Coding Number which includes country code and area code. For example, if you use 10/8 (or 10.0.0.0/255.0.0.0).

GLASGOW: aaa

- Warehouse Staff: 0 = 10.aaa.0.0/24

- Customer Services: 1 = 10.aaa.1.0/24

- Finance: 2 = 10.aaa.2.0/24

BIRMINGHAM: bbb

- Warehouse Staff: 0 = 10.bbb.0.0/24

- Customer Services: 1 = 10.bbb.1.0/24

- Finance: 2 = 10.bbb.2.0/24

ABERDEEN: ccc/ddd

10.ccc.ddd.0/24

NEWCASTLE: eee/fff

10.eee.fff.0/24

LIVERPOOL: ggg/hhh

10.ggg.hhh.0/24

BRISTOL: jjj/kkk

10.jjj.kkk.0/24

LONDON: mmm/nnn

10.mmm.nnn.0/24

You can replace the letters with either country code or area code. If the code is higher than the valid ip address, make some adjustment. When looking at the routing table, you will be able to easily identify where the route/s came from (and where to route it).

Take note that the above is only an example. It depends if you like the idea and if you really want to follow the requirement,

Regards,

Dandy

[scott_mchale]

Hi Dandy,

Thanks for your help...

To let you understand I am currently at the end of my Honours year at University, and although the above is helpful, I am afraid I am still a little confused. Is there an easier way to explain this.

Regards

Scott

[Danilo Dy]

Well, you didn't mentioned this earlier. It seems that this is one of your project or something for your studies?

I guess you have to follow the requirement. Let me work on something and get back to you :)

[scott_mchale]

If you have the time Dandy, I can certainly send you the document.

Scott

[Danilo Dy]

Try this....

[EDIT] Glasgow Office: 10.1.0.0/22 = 10.1.0.0/24, 10.1.1.0/24, 10.1.2.0/24, and 10.1.3.0/24

- 50 Warehouse Staff (+30% = 65) = The closest subnet is 10.1.0.0/25 (maximum hosts is 126)

- 150 Customer services (+30% = 195) = The closest subnet is 10.1.1.0/24 (maximum hosts is 254)

[EDIT]- 100 Finance (+30% = 130) = The closest subnet is 10.1.2.0/24 (maximum hosts is 254)

Birmingham office: 10.2.0.0/23 = 10.2.0.0/24 and 10.2.1.0/24

- 75 Warehouse staff (+30% = 98) = The closest subnet is 10.2.0.0/25 (maximum hosts is 126)

- 100 Customer services (+30% = 130) = The closest subnet is 10.2.1.0/24 ( maximum hosts is 254)

- 75 Finance (+30% = 98) = The closest subnet is 10.2.0.128/25 (maximum hosts is 126)

Five regional sites

Aberdeen 20 staff (+30% = 26): The closest subnet is 10.3.0.0/27 (maximum hosts is 30)

Newcastle 40 staff (+30% = 52): The closest subnet is 10.3.0.128/26 (maximum hosts is 62)

Liverpool 20 staff (+30% = 26): The closest subnet is 10.3.0.32/27 (maximum hosts is 30)

Bristol 20 staff (+30% = 26): The closest subnet is 10.3.0.64/27 (maximum hosts is 30)

london 30 staff (+30% = 39): The closest subnet is 10.3.0.192/26 (maximum hosts is 62)

Other Senior NetPros may be able to advice a better combination :)

[scott_mchale]

Dandy,

Thanks for your help, greatly appreciated.

Much clearer

Thanks again

Scott

[Danilo Dy]

Please check th update [EDIT], sry I was playing AAO :)

[scott_mchale]

the answer you provided has been helpful

thank you

[scott_mchale]

Hi Dandy,

Sorry to bother you again.

Subnetting for Glasgow does not work, it works if we dont allow for 30% growth with the finance department. Or maybe I am doing something wrong. Please advise.

Glasgow Office: 10.1.0.0/23 = 10.1.0.0/24 and 10.1.1.0/24

- 50 Warehouse Staff (+30% = 65) = The closest subnet is 10.1.0.0/25 (maximum hosts is 126)

- 150 Customer services (+30% = 195) = The closest subnet is 10.1.1.0/24 (maximum hosts is 254)

- 100 Finance (+30% = 130) = The closest subnet is 10.1.0.128/25 (maximum hosts is 126)

[Danilo Dy]

Yes, I noticed that, that's why I update the earlier post. Check the [EDIT] portion. Anyway, here it is

Glasgow Office: 10.1.0.0/22 = 10.1.0.0/24, 10.1.1.0/24, 10.1.2.0/24, and 10.1.3.0/24

- 50 Warehouse Staff (+30% = 65) = The closest subnet is 10.1.0.0/25 (maximum hosts is 126)

- 150 Customer services (+30% = 195) = The closest subnet is 10.1.1.0/24 (maximum hosts is 254)

- 100 Finance (+30% = 130) = The closest subnet is 10.1.2.0/24 (maximum hosts is 254)