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From: Noel Jones (njonesmegan.vbhcs.org)
Date: Wed Mar 18 2009 - 08:49:11 CDT
Bill Cole wrote:
> 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
>>>>> % dig resolver1.opendns.com
>>>>> 184.108.40.206.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
>>> they know about it: http://www.opendns.com/support/article/33
>>>> If you must run an MX host, use a real DNS server.
>> 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
> 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.
Your facts are correct, your conclusion is wrong.
But I'm done with this thread.
-- Noel Jones