How Can The Internet Have Too Many Routes, But Not Enough Addresses? – Computerworld

The Latest Internet Outage is a Warning Shot – NASDAQ.com

Last Wednesday, some older routers and switches stumbled when the Internet’s table of routes surpassed 512,000 entries, the maximum they could hold in a special form of memory called TCAM (Ternary Content Addressable Memory). The event drew widespread attention, though it was actually the third time in this young century that the Internet had broken through such a threshold. The number of routes exceeded 128,000 around 2003 and 256,000 in 2008, each time causing problems for some outmoded gear. Devices that don’t have room for all the routes may reboot themselves or fail to route some traffic, but the affected gear was fairly old. Cisco Systems says all the routing products it’s sold for at least the past two years have had enough room in TCAM for more than 512,000 routes. Routers designed for the cores of carrier networks surpassed that long before. Juniper Networks, Cisco’s longtime router rival, said it updated its gear for this problem more than 10 years ago.
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Internet of Things

Too many others choked as the routing table grew past 512,000 entries on Aug. 12, creating a ripple effect that hit sites far and wide. Credit: cidr-report.org.
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How can the Internet have too many routes and not enough addresses? | PCWorld

That would be one silver lining on a cloud thats hung over the network of networks for years. IPv4 cannot grow forever. We already reached a certain limit, so we personally wouldnt expect it to grow much larger, said Sasa Rasovic, incident manager at Ciscos Product Security Incident Response Team.
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