default network (per ocg)
An IOS mechanism for determining a router’s default route, by which the
router is configured with a classful network number as the default network, and the router uses its route for that network as its default route.
router is configured with a classful network number as the default network, and the router uses its route for that network as its default route.
from
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml#route0.0
Use the ip default-gateway command when ip routing is disabled on a Cisco router. Use the ip default-network and ip route 0.0.0.0 0.0.0.0 commands to set the gateway of last resort on Cisco routers that have ip routing enabled. The way in which routing protocols propagate the default route information varies for each protocol.
this from
http://www.mcmcse.com/cisco/guides/ip_default_network.shtml
At first glance, they appear to do the same thing. Both configure a destination to which packets should be routed if there is no more specific route in the routing table.
The major difference between these two options is that configuring a static default route only defines a default route for the router you're configuring it on, while ip default-network will propagate the route via its routing protocol.
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