Qué es IPv6. Curso de redes desde 0 | Cap 3 |
Introduction to IPv4 and IPv6
Overview of IP Addressing
- The speaker introduces themselves as @macjosan on Twitter and mentions the YouTube channel for NASeros, indicating this is the third video in a series about networking.
- A brief recap of previous videos: public IP addresses were discussed in the first video, while private IP addresses were covered in the second. The concept of NAT (Network Address Translation) was also introduced.
Limitations of IPv4
- The speaker explains that there are only about 4 billion possible public IPv4 addresses, which are running out due to an increasing number of devices requiring connectivity.
- To address this limitation, IPv6 was developed, offering an effectively infinite number of public IP addresses.
Understanding IPv6 Functionality
Advantages of Using IPv6
- With IPv6, ISPs can provide multiple public IP addresses to each customer, eliminating the need for NAT since every device can have its own unique public address.
- This means that devices like computers and smartphones would each have their own distinct public IP address without restrictions.
Packet Transmission with IPv6
- Each device's unique public IP allows direct communication over the internet without needing translation from private to public addresses.
- When a device sends a request (e.g., to Google), it uses its own unique IPv6 address as the source in the packet sent through routers.
Transition Challenges from IPv4 to IPv6
Coexistence of Protocols
- Despite the advantages of using only IPv6, transitioning entirely from IPv4 is impractical due to existing infrastructure; both protocols must coexist during this transition period.
Global Adoption Rates
- The speaker notes that some countries are more advanced in adopting IPv6 than others. For example, Spain has low adoption rates at around 4%.
Impact on Developing Countries
IPv4 Limitations and the Need for IPv6
Understanding IP Address Allocation Challenges
- The speaker discusses the limitations of IPv4 addresses, highlighting that a provider like Movistar may have 200,000 assigned public IPs but could serve up to 300,000 subscribers. This discrepancy illustrates the challenges in managing IP address allocation.
- A hypothetical scenario is presented where Movistar has significantly more subscribers than available public IPs. The speaker emphasizes the impracticality of users turning off their routers to free up IP addresses for others.
- Countries facing similar issues have adopted IPv6 due to its virtually limitless number of available IP addresses, contrasting with the finite nature of IPv4.
Current State of IPv6 Implementation
- In Spain, telecommunications operators are lagging in implementing IPv6. The speaker criticizes a workaround called Carrier Grade NAT (CG-NAT), which complicates the transition from IPv4 to IPv6.