Agotamiento IPv4 y estrategias a futuro
Alejandro Acostaalejandro @ lacnic.net
Proposed Solutions
Network Address Translation (NAT), NAT Variations (CGN, LSN, NAT444, etc.)
IPv6.Different types of transition mechanisms:Dualstack, 6rd, NAT64/464xlat, DS-lite, etc.
Network Address Translation (NAT)
It allow several devices to share the same public IP.
Its not a sustainable solution.
NAT Variations
Carrier Grade NAT (CGN)
Large Scale NAT (LSN)
NAT 444
Internet Architecturewith NATs
- More complex Client-server model- Highfault rate- P2P -> almost impossible
CGN
Problems of NAT When sharing the same Ipv4 address, the communication
model peer to peer is altered.
ACLs (Access ControlLists) to avoid certain attacks have important colateral effects
When traffic from a bad customer is blocked, traffic from multiple good customers is also blocked
In order to identify who accessed a service, not only the IP address should be saved but also the port
Problems ofNAT NAT boxes have limitations related to the number of
sessions
Customers from different countries browse the Internet through the same IP address
Country specific web pages (Google, Twitter) will think we are in a different country
Twitter has country specific policy
Geolocationapps will show a wrong location
Problems ofNAT
Port forwarding will become more difficult
Users are behind a NAT they dont control
Issues with games (consoles and network games rely on incoming connections).
Cost: about 40 USD per user approximatelysource:https://www.nanog.org/meetings/nanog56/presentations/Wednesday/wed.general.howard.24.pdf
Conclusion
NAT is a temporary solution
IPv6 is a long term solution!!
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