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Fri Jun 7, 2019, 10:30 AM

Large European routing leak sends traffic through China Telecom

Yesterday (6 June 2019), Swiss data centre co-location company Safe Host (AS21217) leaked over 70,000 routes to China Telecom (AS4134) in Frankfurt, Germany, some for over two hours.

China Telecom then announced these routes onto the global Internet redirecting large amounts of Internet traffic destined for some of the largest European mobile networks through China Telecomís network. Some of the most impacted European networks included Swisscom (AS3303) of Switzerland, KPN (AS1130) of the Netherlands, and Bouygues Telecom (AS5410) and Numericable-SFR (AS21502) of France.

Often routing incidents like this only last for a few minutes, but in this case, many of the leaked routes in this incident were in circulation for over two hours. In addition, numerous leaked routes were more-specifics of routed prefixes, suggesting the use of route optimizers or similar technology.

At 09:57 UTC, over 1,300 Dutch prefixes were announced in this leak. For 470 routes of KPN (AS1136), the leak took the form:

Ö 4134 21217 21217 21217 21217 21217 21217 13237 1136

If someone thought the prepending of AS21217 would keep these routes from leaking out, they were mistaken. Below is a visualization of the propagation profile of a prefix ( announced by Dutch carrier KPN.


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Reply Large European routing leak sends traffic through China Telecom (Original post)
blondebanshee Jun 7 OP
lapfog_1 Jun 7 #1

Response to blondebanshee (Original post)

Fri Jun 7, 2019, 10:37 AM

1. Border Gateway Protocol (BGP) strikes again.


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