Binary exercise 2 for exploration 1 students.
Case study:
As an independant network consultant you have been requested to design the network layout for Ozzie Blink-think PTY ltd, an Australian adaptive technology training company.

They have been advised that they could save significant money by networking their offices in all of Australia's capital cities by utilizing ADSL technology and local internet service providers.
As the executives of the company are concerned about data security it has been decided to install OpenVPN as the VPN technology of choice.
Each site has a Linux router connected to a DSL service with one publically routable ip address assigned by the ISP in the local area. This ip address is assigned directly to the external interface of the Linux box. Each external ip address will be referred to by name.
bl-Sydney, bl-Melbourne, bl-Brisbane, bl-Canberra, bl-tasmania, bl-adailaide, bl-perth and bl-darwin.

Sites wish to communicate with each other in order that a VOIP service can make calls between the various branches.
It is cheaper for Sydney to call Darwin over the internet than it is to use traditional phone service.

Non-routable address space should be utilized on the VPN and all subnets should be uniquely routable on the vpn network.
Each office has a file server to hold local material however central web information is stored in Canberra.

Design a subnet scheme on a non-routable block of ip addresses that will allow all machines to communicate. Note that some allocations may need to be larger than a class c.
Students do not need access to the vpn and should be on separate subnets from staff for security reasons.
Make sure to allocate an ip address for the Linux router, the office file server and other requirements.
The offices have the following numbers of staff and students. 
Sydney: 20 admin staff, 3 servers, 5 printers, and 50 workstations.
Brisbane: 10 admin staff,1 server, 3 printers and 25 students.
Canberra: 11 admin staff, 7 servers, 3 printers and 40 workstations.
Melbourne: 20 admin staff, 5 printers, 6 servers  and 100 students.
Tasmania: 5 admin staff, 2 printers, 2 servers and 15 students.
Adalaide: 5 admin staff, 2 printers, 3 servers and 11 students.
Perth: 15 admin staff, 5 printers, 4 servers and 45 students.
Darwin: 4 admin staff, 2 printers, 2 servers and 22 students.

Show the routing table for the Sydney, Perth and Darwinrouters.
Note that it is cheaper to route traffic to Perth before it is sent along to Darwin.
All vpn traffic must return via Perth from Darwin.
Show a traceroute from Darwin to Sydney, replacing internet hops with <cloud>