Telematics Chapter 6: Network Layer - Freie Universität Berlin

Transition from IPv4 to IPv6
● Tunneling
● Router at the entry to the IPv4-based network encapsulates an incoming IPv6
packet into a new IPv4 packet with destination address of the next router also
supporting IPv6
payload
Server
Computer
Computer
Ethernet
IPv6
header
Computer
IPv6 network
payload
IPv6
header
Internet
mostly IPv4
IPv4
header
IPv6 “tunnel” through IPv4
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer
payload
Computer
Computer Server
Ethernet
IPv6
header
Computer
IPv6 network
● More overhead because of two headers for one packet, but no information loss
● Tunneling is a general concept also used for multicast, VPN, etc: it simply means
“pack a whole packet as it is into a new packet of different protocol”
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