Cloudflare Chief Technology Officer John Graham-Cumming told the Washington Post that Verizon failed to intercept the issue from a fiber-optic network services provider. This caused a routing leak that led to the widespread system outage.
“Normally a large network would do some kind of filtering,” Graham-Cumming said. “But in this case, [Verizon] passed it on.”
Because of this, Verizon customers lost large chunks of internet access and passed on the faulty information to other networks, including Cloudflare and Amazon Web Services, Graham-Cumming said. This affected 10 percent of Cloudflare’s traffic.
Graham-Cumming added that Verizon still has not responded to the company’s outreach. Cloudflare CEO Matthew Prince echoed this on Twitter.
Matthew Prince 🌥
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@eastdakota
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The teams at @verizon and @noction should be incredibly embarrassed at their failings this morning which impacted @Cloudflare and other large chunks of the Internet. It’s absurd BGP is so fragile. It’s more absurd Verizon would blindly accept routes without basic filters.
Matthew Prince 🌥
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@eastdakota
It’s networking malpractice that the NOC at @verizon has still not replied to messages from other networking teams they impacted, including ours, hours after they mistakenly leaked a large chunk of the Internet’s routing table.