IPv4 Addressing, Long Term Solution: IPv6 And Subnet Example

Long Term Solution: IPv6

• IPv6, or IPng (IP – the Next Generation) uses a 128-bit address space, yielding
    possible addresses.
• IPv6 has been slow to arrive
• IPv4 revitalized by new features, making IPv6 a luxury, and not a desperately needed fix
• IPv6 requires new software; IT staffs must be retrained
• IPv6 will most likely coexist with IPv4 for years to come.
• Some experts believe IPv4 will remain for more than 10 years.

IPv4 Addressing

Subnet Mask
One solution to the IP address shortage was thought to be the subnet mask.
Formalized in 1985 (RFC 950), the subnet mask breaks a single class A, B or C network in to smaller pieces.

Short Term Solutions: IPv4 Enhancements

CIDR (Classless Inter-Domain Routing) – RFCs 1517, 1518, 1519, 1520
VLSM (Variable Length Subnet Mask) – RFC 1009
Private Addressing - RFC 1918
NAT/PAT (Network Address Translation / Port Address Translation) – RFC


IPv4 versus IPv6

IP version 6 (IPv6)  has been defined and developed.  
IPv6 uses 128 bits rather than the 32 bits currently used in IPv4.
IPv6 uses hexadecimal numbers to represent the 128 bits.

Subnet Example

Network address with /16 

network mask

Using Subnets: subnet mask 
or /24

Subnet Example

Subnet 0 (all 0’s subnet) issue:  The 


of the subnet, is the same 

address as the major network,

Last subnet (all 1’s subnet) issue:  The 

broadcast address for the subnet, is the same as the 

address as the major network,

Subnet Example

Given the Class B address

Subnet Example

Using the 3rd octet, was divided into:  and so on ...


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