How Can The Internet Have Too Many Routes And Not Enough Addresses? | Pcworld

But the short supply of older addresses and the expected growth of the Internet of Things eventually will bring more IPv6 addresses into service, Cowie said. That will raise issues of its own. Now that IPv6 has been introduced, more and more devices are going to be connected, Rasovic said. The tables are different [in IPv6], and theyre managed differently in memory. Its hard to know how many IPv6 routes there could eventually be, Cowie said. Those routes will all take up more memory, because an IPv6 address is much longer than one from the older version. Network engineering groups are already trying to figure out how to manage IPv6 routes, according to Cisco. The IPv4 route-table problem will be with us for a long time, according to Cogents Schaeffer.
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The Routing Wall of Shame – IEEE Spectrum

IT Hiccups of the Week

Sadly, this elderly gear was shipped at a time when the world was full of hope for the emergence of a real, live, flourishing IPv6 routing table. For those who don’t know, IPv4 is a 32-bit addressing system for defining destinations on the Internet. IPv6 — a purported replacement — uses a 128-bit addressing system. Think of it like the U.S. zip code. Five digits works because we live in a country with finite borders. Cyberspace isn’t bound by the same physical limits; 128-bits is the safer choice because it allows for more destinations.
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The Latest Internet Outage is a Warning Shot – NASDAQ.com

A story at SiliconANGLE reported that Amazon and LinkedIn were also affected by service disruptions, while ZDNet indicated that U.S. Internet service providers Level 3, AT&T, Cogent, Comcast, Sprint, Time-Warner and Verizon all experienced sporadic performance problems across the United States and parts of Canada. The Register also reported that Canadian ISP Shaw Communications had suffered from fairly severe network disruptions as well. The reported culprit behind last weeks disruptions appears to be a well-known network technical risk that turned into a not-unexpected annoying problem: the global Internet routing table apparently exceeded 512,000 routes . As a result, many older routers that cannot support more than that number of routes because of memory and other limitations are at risk of sporadically causing some level of local Internet service instability until they are upgraded or replaced to handle the ever increasing number of Internet routes [pdf]. Speculation was that Tuesdays disruptions were caused in partor at least exacerbatedby the network activity of Verizon, which pushed the routing table to exceed the 512K threshold for a short time.
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