Example Network:The Virtual BreweryLinux Network Administrators GuidePrevNextAppendix A. Example Network:The Virtual BreweryThroughout this book we've used the following example that is a little less
complex than Groucho Marx University and may be closer to the tasks you will
actually encounter.The Virtual Brewery is a small company that brews, as the name suggests,
virtual beer. To manage their business more efficiently, the virtual brewers
want to network their computers, which all happen to be PCs running the
brightest and shiniest production Linux kernel. Figure A-1 shows the network configuration.On the same floor, just across the hall, there's the Virtual Winery, which
works closely with the brewery. The vintners run an Ethernet of their own.
Quite naturally, the two companies want to link their networks once they are
operational. As a first step, they want to set up a gateway host that
forwards datagrams between the two subnets. Later, they also want to have a
UUCP link to the outside world, through which they exchange mail and news. In
the long run, they also want to set up PPP connections to connect to offsite
locations and to the Internet.The Virtual Brewery and the Virtual Winery each have a class C subnet of
the Brewery's class B network, and gateway to each other via the host
vlager, which also supports the
UUCP connection. Figure A-2 shows the configuration.Figure A-1. The Virtual Brewery and Virtual Winery subnetsFigure A-2. The Virtual Brewery NetworkConnecting the Virtual Subsidiary NetworkThe Virtual Brewery grows and opens a branch in another city. The
subsidiary runs an Ethernet of its own using the IP network number
172.16.3.0, which is subnet 3 of the
Brewery's class B network. The host
vlager acts as the gateway for the
Brewery network and will support the PPP link; its peer at the new branch is
called vbourbon and has an IP address
of 172.16.3.1. This network is
illustrated in Figure A-2.
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