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2021-11-06 20:52:12 +01:00
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# IPv6
**IPv4 has several problems:**
- Scarce IPv4 address.
- IPv4 header contains fields that are not used by every packet (should be optional)
- IPv4 imposes extra processes on routers, the network can become slower (such as fragmentation and checksum calculations)
- IPv4 does not provide any security measurement at network layer.
**IPv6 Format:**
![[IPV6-format.png]]
Most of the mandatory fields of IPv4 header and some of IPv4 options are available trough IPv6 options. (Linked by next header)