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Saturday, 22 February 2020

IPv4 Addressing And Short Term Solutions: IPv4 Enhancements

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.

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