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

[scott_mchale]

Hi Dandy,

Everything looking good so far, just one other question.....each region also has a number (up to 5) of smaller branch sites with less than 10 staff each. So correct me if iam wrong...5 * 10= 50 for each smaller branch office....so total would be 250 * 30%...

Scott

[keeleym]

Hi Scott

Just to add as this is for a Uni Project. The initial posting stated that the company received a range of "Class C" networks so when you are writing this up, change the first octet from "10" to any number betwen 192 and 224 as this is the range of the Class C networks. The 10.x.x.x range are (a) Class A and (b) private Class A addresses (covered by RFC 1918).

Also do not use 192.168.x.x as this is the Class C private range (covered by RFC 1918) and the initial posting stated that the range of Class C networks provided by the ISP were "Public" networks.

Best Regards,

Michael

[scott_mchale]

Michael

Your time and expertise is greatly appreciated.

Many thanks

Scott

[keeleym]

Hi Scott

No problem and thank you for the rating.

One correction to my above post, the range of Class C addresses is 192 - 223, not 224 as posted above.

Addresses which start with 224 are Class D addresses and used for Multicast addressing.

Best Regards and god luck with the project,

Michael

[scott_mchale]

Michael,

Probably fed up with my questions, but could I ask, does this look ok!!!

Glasgow 195.168.0.0/22

Subnet Name Needed Size Allocated Size Address Mask Dec Mask Assignable Range

Customer Services 195 254 195.168.0.0 /24 255.255.255.0 195.168.0.1 - 195.168.0.254

Finance 130 254 195.168.1.0 /24 255.255.255.0 195.168.1.1 - 195.168.1.254

Warehouse 65 126 195.168.2.0 /25 255.255.255.128 195.168.2.1 - 195.168.2.126

Birmingham 195.169.0.0/23

Subnet Name Needed Size Allocated Size Address Mask Dec Mask Assignable Range

Customer Services 130 254 195.169.0.0 /24 255.255.255.0 195.169.0.1 - 195.169.0.254

Finance 98 126 195.169.1.0 /25 255.255.255.128 195.169.1.1 - 195.169.1.126

Warehouse 98 126 195.169.1.128 /25 255.255.255.128 195.169.1.129 - 195.169.1.254

Regional Sites 195.170.0.0/23

Subnet Name Needed Size Allocated Size Address Mask Dec Mask Assignable Range

Newcastle 52 62 195.170.0.0 /26 255.255.255.192 195.170.0.1 - 195.170.0.62

London 39 62 195.170.0.64 /26 255.255.255.192 195.170.0.65 - 195.170.0.126

Aberdeen 26 30 195.170.0.128 /27 255.255.255.224 195.170.0.129 - 195.170.0.158

Bristol 26 30 195.170.0.160 /27 255.255.255.224 195.170.0.161 - 195.170.0.190

Liverpool 26 30 195.170.0.192 /27 255.255.255.224 195.170.0.193 - 195.170.0.222

Branch Sites 195.171.0.0/22

Subnet Name Needed Size Allocated Size Address Mask Dec Mask Assignable Range

Small Branch_Aberdeen 65 126 195.171.0.0 /25 255.255.255.128 195.171.0.1 - 195.171.0.126

Small Branch_Bristol 65 126 195.171.0.128 /25 255.255.255.128 195.171.0.129 - 195.171.0.254

Small Branch_Liverpool 65 126 195.171.1.0 /25 255.255.255.128 195.171.1.1 - 195.171.1.126

Small Branch_London 65 126 195.171.1.128 /25 255.255.255.128 195.171.1.129 - 195.171.1.254

Small Branch_Newcastle 65 126 195.171.2.0 /25 255.255.255.128 195.171.2.1 - 195.171.2.126