On 11/27/10 8:21 PM, Nick B wrote:
Does or can unbound be configured to prioritise recursive queries using the lowest RTT values, maybe from the Infra cache? In this instance 'K' is preferable to 'M' for example.
Hello Nick,
Unbound is using "RTT banding", it randomly pickes a server within a so-called RTT band of 400 msec, see
http://www.unbound.net/documentation/info_timeout.html and http://www.unbound.net/documentation/patch_announce102.html
Destination address randomisation. Unbound performs RTT banding, a method to select the destination server that provides additional randomness. This provides between 1 and 4 bits of randomness. Perhaps 2 on average. Arguments that choosing the fastest destination reduces the attack time window are no longer relevant given the recent full disclosure at the Blackhat conference. Additional time windows are easily achieved.
-- Carsten _______________________________________________ Unbound-users mailing list [email protected] http://unbound.nlnetlabs.nl/mailman/listinfo/unbound-users
