Re: dnscache and oversized answers

>> Take  a look  at  them.  Their servers  are  doing  load balancing  by
>> rotating the answers.
>
> Yes, I  did actually look  at the answers  provided by dig  although not
> closely enough to  notice that they are rotating answers.  I wasn't able
> to use  dnsq to resolve  them (which isn't  part of dnscache)  either so
> apparently the packets get discarded  by the library. I haven't actually
> looked at  the code so  this is just  guesswork at this  point.

All quite true.  I used dig, which seems not to care about answer sizes.

What XO is doing is actually quite silly.  Rotating MXes is sensible, but 
returning 8 of them at different distances is ridiculous.  Unless they 
expect half of them to be offline, no client is likely to try more than 
the top two or three so the other five answers and matching authorities 
are just bloat.

Regards,
John Levine, [email protected], Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://www.johnlevine.com, ex-Mayor
"More Wiener schnitzel, please", said Tom, revealingly.