nanog mailing list archives
Re: DNS anycast considered harmful (was: .ORG problems this evening)
From: "Stephen J. Wilcox" <steve () telecomplete co uk>
Date: Thu, 18 Sep 2003 13:16:10 +0000 (GMT)
On Thu, 18 Sep 2003, Todd Vierling wrote:
On Thu, 18 Sep 2003, Stephane Bortzmeyer wrote: : > Still doesn't help .ORG, which is 100% anycast and thus has no DNS-based : > redundancy : : Wrong since there are two IP addresses. They may fail at the same time : (which apparently happened to you) but there is a least an element of : non-BGP redundancy (I'm not aware of any TLD running with only one : anycasted name server, although it would still have some redundancy). Okay, let me qualify then: "...no DNS-based redundancy when both routes point to the same place and that particular place goes off the air while its BGP advertisements stay up and running..." DNS-based redundancy typically implies going to different servers at different locations, regardless of what BGP says. The fact that anycast took me to the same place for both IPs, and that same place went down all at once, means that I was effectively looking at a single point of failure with no way for DNS to pick another place to look.
Okay but 1. Only you were affected 2. Only you have both servers going to the same place Theres a theme in this, perhaps indicating where the problem may have been :)
Current thread:
- .ORG problems this evening Todd Vierling (Sep 17)
- Re: .ORG problems this evening Jared Mauch (Sep 17)
- Re: .ORG problems this evening Todd Vierling (Sep 18)
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Iljitsch van Beijnum (Sep 18)
- Message not available
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Todd Vierling (Sep 18)
- Message not available
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Todd Vierling (Sep 18)
- Message not available
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Todd Vierling (Sep 18)
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Stephen J. Wilcox (Sep 18)
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Todd Vierling (Sep 18)
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Leo Bicknell (Sep 18)
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Todd Vierling (Sep 18)
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Iljitsch van Beijnum (Sep 18)
- RE: DNS anycast considered harmful (was: .ORG problems this evening) David Schwartz (Sep 18)
- Re: .ORG problems this evening Todd Vierling (Sep 18)
- yo' grammar so funny (was Re: DNS anycast considered harmful) Todd Vierling (Sep 18)
- Re: .ORG problems this evening Jared Mauch (Sep 17)
- Re: DNS anycast considered harmful (was: .ORG problems this evening) Stephen J. Wilcox (Sep 18)
- Re: .ORG problems this evening Stephen J. Wilcox (Sep 18)
- Re: .ORG problems this evening Todd Vierling (Sep 18)
- Re: .ORG problems this evening Rodney Joffe (Sep 18)