Noel Jones wrote, On 3/15/09 4:26 PM:
Sahil Tandon wrote:
On Sun, 15 Mar 2009, Wietse Venema wrote:
Sahil Tandon:
OpenDNS will not blindly redirect DNS queries that look like DNSBL
requests. Notice the difference:
% dig @resolver1.opendns.com www.abcdefghijklmnop12345.com +short
208.69.32.132
% dig @resolver1.opendns.com
40.30.20.10.www.abcdefghijklmnop12345.com +short
%
Note, this still breaks lookups of rfc-ignorant.org and other sites
that blacklist domain names instead of IP addresses.
FWIW, OpenDNS appears to work with rfc-ignorant.org, but that's only
because
they know about it: http://www.opendns.com/support/article/33
If you must run an MX host, use a real DNS server.
Agreed!
If you sign up for a free account at OpenDNS you can turn off their
helpful typo-correction feature.
Then OpenDNS works splendidly on an MX.
They do have a clue.
No volume or quality of clues can trump the hard limit of the speed of light...
The hardest problem with using someone else's DNS server (i.e. one many
miles away across multiple router hops) for an MX host is that it will come
with higher hard query latency (i.e. ultimately 'c' bound) and with less
easily predicted higher latencies relative to a local cache that is
dedicated to the MX host(s), which would have higher cache hit rates.
