commit 522e90d6610da3ca809c842b452c56ecab5d501b Author: Nick Mathewson nickm@torproject.org Date: Sun Nov 25 16:38:29 2012 -0500

Changes file for new DNS caching options --- changes/prop205-simplified | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/changes/prop205-simplified b/changes/prop205-simplified new file mode 100644 index 0000000..c764fea --- /dev/null +++ b/changes/prop205-simplified @@ -0,0 +1,21 @@ + o Major features: + + - The updating and usage of DNS cache is now configurable on a + per- client-port level. SOCKSPort, DNSPort, etc lines may now + contain {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we + shouldn't cache these types of DNS answers when we receive them + from an exit node in response to a request from this port, and + {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have + cached DNS answers of these types, we shouldn't use them. It's + potentially risky to use cached DNS answers at the client, + since doing so can indicate to one exit + what answers we've gotten for DNS lookups in the past. With + IPv6, this becomes especially problematic. Using cached DNS + answers for requests on the same circuit would present less + linkability risk, since all traffic on a circuits is already + linkable, but it would also provide little performance benefit: + the exit node caches DNS replies too. Implements a simplified + version of Proposal 205. + + +