On Fri, 24 Apr 2009, Dave Mill wrote:
I think in the past alien/terminator would ignore low TTLs. I seem to recall something around the 7200 mark. However, I believe this is no longer the case.
Some ISP's automate the removal of old zones from their DNS servers, others don't. The others generally just need a gentle prod to the right people (preferably not this list) to get them removed. The technical contact in their domain's WHOIS records is generally a good place to start.
+1. At least one ISP that I know fairly well took the approach that until actually contacted by the customer in an authenticated manner, removing the zones construed 'unnotified cancellation of a service' and therefore would not remove zones - notwithstanding the registry - unless the customer asked them to. This perspective extended to mail handling for the domain concerned, and caused no end of grief as a result... I'm not going to be specific, because it's probably spilt milk these days; entirely likely said system has been retired. Still, I know how history can taint an individuals view of the world...
On another DNS note, has the extremely low TTL setting for Facebook A records caused any issues to other ISPs?
I've heard reports of slow load times associated with slow / poor performance of the reportee's DNS platform. Low TTL's have a flow-on load hit which is fine if you have sufficient overhead to deal with it, I suppose... Mark.