IP Router & IP Forwarding Table

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The discussion revolves around creating an IP forwarding table for a router with four interfaces, utilizing CIDR notation for network addresses. The user provides initial entries for the forwarding table but questions the correctness of the CIDR notation for Interface 2, noting a discrepancy between their solution and the manual's. The correct CIDR for Interface 2 is debated, with the user seeking clarification on why their entry differs from the manual's. The conversation highlights the importance of understanding CIDR notation and its application in IP routing. Clarification on this topic is crucial for accurate network configuration.
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Homework Statement



Consider an IP Router with four link interfaces numbered 0 to 3. Packets are to be forwarded according to the table:
http://img688.imageshack.us/img688/4844/iproutertable.jpg

Write down an IP forwarding table with ve entries that forwards packets to the correct interfaces. Use CIDR (Classless Interdomain Routing) notation for the network addresses.

The Attempt at a Solution



Interface 0: 11100000 00 -> 224.0.0.0/10

Interface 1: 11100000 01000000 -> 224.64.0.0/16


Interface 2: 11100001 0 -> 225.0.0.0/9 (Solution manual says it should be 1110000 -> 225.0.0.0/7 --- Why/How?)
 
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Anyone? really need help with this one...
 

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