nanog mailing list archives
Re: Intermittent incorrect DNS resolution?
From: "Erik Levinson" <erik.levinson () uberflip com>
Date: Wed, 16 Jan 2013 23:09:39 -0500 (EST)
Thanks Joe and thanks everyone else for the on and off-list replies. Quite insightful. I think we've reached the consensus that the problem is the ignoring of TTLs as opposed to misbehaving/stale authoritative servers. So for now I shall wait. To give an idea of the scale of the problem right now, I'm getting thousands of requests per minute to a new IP vs. about two requests per minute on the equivalent old IP, with over 60% of the latter being Baidu, but also a bit of Googlebot and other random bot and non-bot UAs. Perhaps next week I'll unbind some old IPs for a few minutes to see what happens. -----Original Message----- From: "Joe Abley" <jabley () hopcount ca> Sent: Wednesday, January 16, 2013 8:57pm To: "Erik Levinson" <erik.levinson () uberflip com> Cc: "Christopher Morrow" <morrowc.lists () gmail com>, nanog () nanog org Subject: Re: Intermittent incorrect DNS resolution? On 2013-01-16, at 14:33, Erik Levinson <erik.levinson () uberflip com> wrote:
True...I did try 4.2.2.2 / 8.8.8.8 and some local ones here. All looked fine.
I sent queries from 270+ different locations for the domains you mentioned off-list and I didn't see any inconsistencies. The persistent host-caching/browser-caching theories seem like your best bet (or my 270+ locations weren't sufficiently diverse to catch a stale zone being served by an anycast authority server). Joe
Current thread:
- Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? George Herbert (Jan 16)
- Re: Intermittent incorrect DNS resolution? RijilV (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? RijilV (Jan 16)
- Re: Intermittent incorrect DNS resolution? Christopher Morrow (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? Christopher Morrow (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? Joe Abley (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? Damian Menscher (Jan 17)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 17)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 17)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? George Herbert (Jan 16)
- Re: Intermittent incorrect DNS resolution? Robert Bonomi (Jan 16)
- Re: Intermittent incorrect DNS resolution? Vinny Abello (Jan 18)
- RE: Intermittent incorrect DNS resolution? Keith Medcalf (Jan 19)
- Re: Intermittent incorrect DNS resolution? Vinny Abello (Jan 20)