Linux IPv6 routing table max_size badly dimensioned compared to IPv4

Hi everybody,

Today, a PowerDNS (open source dns, deployment ran into
trouble with large amounts of IPv6 users. It appears a large telco 'flicked
the switch'. We had around 8000 DNS queries/s over IPv6, and everything
slowed to a crawl. 100% CPU utilization, most of it in the kernel. The same
amount of queries over IPv4 causes no problems.

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