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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  • 1. NAD710 - Introduction to Networks Using Linux Splitting a class C network into 4 subnets February 2,2001 Professor Tom Mavroidis
  • 2. 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.
  • 3. 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:
  • 4. 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.
  • 5. 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
  • 6. Valid Subnet
    • Network is unique on either side of the Router. 192.168.1 + 192.168.2
  • 7. Invalid Network
    • Same Network resides on both sides of Router. 192.168.1
  • 8. 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
  • 9. List of networks for 192.168.1.1
    • The four networks we will get are
  • 10. Network Address Calculation
    • Binary and to get the network address 192.168.1.0
  • 11. Host Address
    • Invert the subnet and do a binary and again to get the host address 0.0.0.1
  • 12. Broadcast address
    • XOR to get the Broadcast address 192.168.1.63