Quote:
Originally Posted by EvanED
In addition, it will occasionally forget the IP at which point it goes back to that.
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Sorry for not reading your full post, Im in rush atm
Which site the dns server *forget* the IP? I suspect the TTL is too short here. IIRC, there are some sites like facebook which uses DNS roundrobin, the TTL is set only for 1 min. If the next dns request is > 1 min after the previous one, the dns server *forgets* IP (A record) and needs to query the authorative dns server of the facebook site again.
TTL can be checked with dig