Sporadic but noticable SERVFAILs in specific nodes of an anycast resolving farm running BIND

sthaug at nethelp.no sthaug at nethelp.no
Sat Mar 8 21:30:06 UTC 2014

> > One mitigation approach is to blackhole the domains using local zones.
> That’s not much of a mitigation. Not having open resolvers would be mitigation.

Not having open resolvers is good - but unfortunately doesn't help
against misbehaving clients (e.g. small home routers with DNS proxies
open to queries from the WAN side).

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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