Puppet users - Jun 2010 - question about variable scope in nodes

my node definitions look like this:

node basenode {
$utility_network = x.x.x.x
[...]
}

node ''mcp.c42'' inherits basenode {
	$my_local_network = $utility_network
	$my_default_gateway = $utility_default_gateway
	$my_netmask = $utility_netmask
	$my_eth1_default_gateway = $my_default_gateway
	$my_eth1_network_addresses = ["10.x.x.x"]
	include general
	include network #<-- sets up the network like IP addresses, etc
	include puppet::master
}

id like to simplify it like this:
(or something like it)

node ''mcp.c42'' inherits basenode {
	$eth = ["10.10.31.250"]
	include general
        include GET_NETWORK_PARAMS_BASED_ON_ADDRESS #<-- parse the IP
and ''figure out'' the netmask, etc...
	include network #<-- uses network params like IP address
	include puppet::master #<-- also uses network params like
''local_network''
}

I''d like to be able to define a node by entering only it''s ip
address.
we also use multiple interfaces so I was thinking that I''d need to use
a define to ''define'' eth0 or eth1.

my question is that once I define that interface, the other modules
might need to know information about it like netmask. How do I make
the variables created in a define in my node available to the other
classes?

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