IPv6 Current version of the Internet Protocol is Version 4 (v4) Earlier versions were not implemented The next version will be Version 6 (v6) No v5 was implemented Informally called IPng (Next Generation) IPv6 is Already Defined Continuing improvements in v4 may delay its adoption

IPv6 IPv6 will raise the size of the internet address from 32 bits to 128 bits Now running out of IP addresses Will solve the problem But current work-arounds are delaying the need for IPv6 addresses

IPv6 Improved Security Improved Quality of Service (QoS) But, through IPsec, v4 is being upgraded in security as well Improved Quality of Service (QoS) But under IETF Differentiated Services (diffserv) initiative, IPv4 is being upgraded in this area as well

IPv6 Extension Headers IPv4 Headers are complex IPv6 basic header is simple Extension headers for options Basic Header Extension Header 1 Extension Header 2

IPv6 Extension Headers Basic header has 8-bit Next Header field Identifies first extension header or says that payload follows Basic Header NH Extension Header 1 Extension Header 2

IPv6 Extension Headers Each extension header also has 8-bit Next Header field Identifies next extension header or says that payload follows Basic Header Extension Header 1 NH Extension Header 2

IPv6 Extension Headers Next header field is an elegant way to allow options Easy to add new extension headers for new needs Basic Header Extension Header 1 NH Extension Header 2