IPv4 exhaustion and the way forward. Guillermo Cicileo
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1 IPv4 exhaustion and the way forward Guillermo Cicileo
2 HOW ARE INTERNET ADDRESSES ASSIGNED?
3 Allocation of Internet number resources IANA IANA (Internet Assigned Numbers Authority) actualmente bajo la responsabilidad de ICANN (Internet Corporation for Assigned Names and Numbers) AFRINIC APNIC ARIN LACNIC RIPE ISP ISP Usuario Final Usuario Final Usuario Final
4 Regional Internet Registries - RIRs
5 IPv4 exhaustion Starting 2011, IANA depleted its IPv4 central stock RIR IPv4 resources APNIC Last /8 since April 2011 RIPE Last /8 since Septembrer 2012 LACNIC Stage 2 of IPv4 exhaustion since June 2014 ARIN Depleted its IPv4 stock on July 2015 AfriNIC It s the only RIR with IPv4 addresses available
6 Why do we say IPv4 is exhausted? More restrictive policies for IPv4 assignment Before: assignment based on organization needs Organization size, adequate justification of need Now: maximum block is /22 (1024 addresses) Independent of organization size, type, coverage, etc
7 APNIC Region
8 RIPE NCC Region
9 Allocated IPv4 Addresses (total) 300 Allocated IPv4 Addresses (Millions) Fuente: Allocated IPv4 Addresses (Millions)
10 Daily assignment rate Fuente:
11 LACNIC IPv4 exhaustion : /8s IPv4 addresses End of stage 2 modelo 1: modelo 2: modelo 3:
12 WHAT TO DO NOW?
13 Connected users and devices growth
14 Three possible options Carrier grade NAT / Large scale NAT No large-scale growth Secondary markets of IPv4 addresses Increasings costs & short term solution IPv6 deployment with possible transition techniques: NAT64/DNS64, 464XLAT, MAP, dual stack with CGN
15 What are ISPs doing in LAC? Most of the ISP are deploying CGN for massive access: In the mobile network In the residential network (xdsl+hfc) When users have problems with CGN, they assign a public IP For corporate access: usually public IP addresses are used Not a good solution
16 CGN problems Sharing one IP address implies a change to the point to point IP communication model of Internet ACLs (access lists) filters have collateral effects Blocking some "bad" traffic may block also "good" clients Problems to identify IP use: it will be necessary to store IP+ports to know who is behind an IP address NAT boxes have problems with large number of sesions Some applications do not work trough CGN Geolocation problem: customers from different countries may share the same IP address
17 The answer is IPv6 Designed during the 90s is the definite solution to address shortage What s different? Too much larger address space: 128 bits 2^128 > 3,40*10^38 IP addresses One single LAN can have many more addresses than the current Internet An ISP may have 2^32 subnets (the same address space that the whole current Internet)
18 Important: both protocols will coexist for long time There is no migration but a gradual transition A number of transition techniques have been defined At the beginning were based on a mostly IPv4 Internet Dual Stack Variety of tunnels Currently thought for an IPv6 Internet Translation: NAT64/DNS64 464XLAT, MAP-T, MAP-E, DS-Lite & more
19 IPv6 deployment (wrt IPv4)
20 Content in IPv6 People usually say: there s no content on IPv6 That s a misconception: At least half of the content accessed from different networks and countries is already on IPv6 Traffic is what matters, not the nominal number of websites Most of CDNs, Google, Youtube, Netflix, Facebook, etc, are already on IPv6
21 Deploying IPv6 now CGN will be less loaded More than half of traffic will go through IPv6 Apps that don t work behind CGN will go native on IPv6 Apps that use a lot of sessions will go native on IPv6 Less problems with users, fewer complaints to help desk
22 Other posibilities Deploying 464XLAT on mobile network Dual translation for allowing IPv4-only apps to work No more necessary to have dual stack IPv6 only network on the mobile Deploying IPv6 only Datacenters Using NAT64 or 464XLAT it s an option See draft-ietf-v6ops-siit-dc-03 SIIT-DC: Stateless IP/ICMP Translation for IPv6 Data Centre Environments
23 IPv6 is a must Internet growth continues IPv4 exhaustion is a consequence of Internet success New regions impose an increasing demand New devices allways connected and globally accesible Address shortage it s a limiting condition for Internet growth and development IPv6 is ready It s the only protocol designed to replace IPv4
24 Thanks
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