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Splitting A Class C Network Into 4 Subnets
 

Splitting A Class C Network Into 4 Subnets

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Splitting A Class C Network Into 4 Subnets

Splitting A Class C Network Into 4 Subnets

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    Splitting A Class C Network Into 4 Subnets Splitting A Class C Network Into 4 Subnets Presentation Transcript

    • NAD710 - Introduction to Networks Using Linux Splitting a class C network into 4 subnets February 2,2001 Professor Tom Mavroidis
    • Things to Remember
      • RFC950 - old rules, over 5 years old
      • Still used in some netware servers, if unsure about environment adhere to RFC950.
      • RFC1812 - new rules, simplifies networking, introduces CIDR (Classless Inter-Domain routing).
      • Suse 6.4 supports IPv4.
    • Review-RFC950
      • An IP Address is broken up into three parts: the network portion, the subnet portion (optional), and the host portion. The size of the network portion is determined by the first byte of the address:
    • Rules - RFC950
      • All hosts on the same subnet must agree on the subnet mask. Otherwise, packets actually intended for another subnet may never leave the existing subnet: a host won't give to the router a packet it thinks is destined for the local segment.
    • Rules - RFC950
      • No two different subnets can include the same host address.
      • The top and bottom host numbers are reserved; the bottom one is shorthand for the whole subnet, and the top one is the broadcast address.
      • The bits in the subnet portion cannot be all ones
    • Valid Subnet
      • Network is unique on either side of the Router. 192.168.1 + 192.168.2
    • Invalid Network
      • Same Network resides on both sides of Router. 192.168.1
    • 192.168.1.1 or 11000000.10101000.00000001.00000001
      • Lets break this network down into 4 subnets
      • That means we need to borrow 2 bits from the host octet (byte).
      • Our default subnet mask is 255.255.255.0 or 11111111.11111111.11111111.00000000
      • Borrowing 2 bytes gives us 128 + 64 = 192 or 11111111.11111111.11111111.11000000 or referred to as /26 or in dotted decimal notation
    • List of networks for 192.168.1.1
      • The four networks we will get are
    • Network Address Calculation
      • Binary and to get the network address 192.168.1.0
    • Host Address
      • Invert the subnet and do a binary and again to get the host address 0.0.0.1
    • Broadcast address
      • XOR to get the Broadcast address 192.168.1.63