Parece ser um pouco diferente agora no último snapshot de desenvolvimento do bind10:
bind10-devel-20110819/src/lib/resolve/recursive_query.h:
80 /// \param query_timeout Timeout value for queries we sent, in ms
81 /// \param client_timeout Timeout value for when we send back an
82 /// error, in ms
83 /// \param lookup_timeout Timeout value for when we give up, in ms
84 /// \param retries how many times we try again (0 means just send and
85 /// and return if it returs).
86 RecursiveQuery(DNSService& dns_service,
...
93 int query_timeout = 2000,
94 int client_timeout = 4000,
95 int lookup_timeout = 30000,
96 unsigned retries = 3);