nanog mailing list archives
Re: .ORG problems this evening
From: Alex Bligh <alex () alex org uk>
Date: Fri, 19 Sep 2003 16:23:27 +0100
--On 18 September 2003 10:05 -0400 Todd Vierling <tv () duh org> wrote:
DNS site A goes down, but its BGP advertisements are still in effect. (Their firewall still appears to be up, but DNS requests fail.) Host site C cannot resolve ANYTHING from DNS site A, even though DNS site B is still up and running. But host site C cannot see DNS site B!
What you seem to be missing is that the BGP advert goes away when the DNS requests stop working. I have written DNS/BGP code (nothing to do with UltraDNS) and I can tell you it works very well. Even if you unplug the machine from the net you can get rapid failover by tweaking a BGP timer here or there. If you are going to say "yes but that means I don't have one of the servers up whilst routing reconverges" this is true, but (a) it happens ANYWAY, (b) as the prefered route is in general more local, the "rainshadow" from routing reconvergence in the event of disruption is smaller. Alex
Current thread:
- Re: .ORG problems this evening, (continued)
- Re: .ORG problems this evening Keptin Komrade Dr. BobWrench III esq. (Sep 18)
- Re: .ORG problems this evening E.B. Dreger (Sep 18)
- Re: .ORG problems this evening Todd Vierling (Sep 18)
- Re: .ORG problems this evening E.B. Dreger (Sep 18)
- Re: .ORG problems this evening Stephen J. Wilcox (Sep 18)
- Re: .ORG problems this evening bmanning (Sep 18)
- Re: .ORG problems this evening E.B. Dreger (Sep 18)
- Re: .ORG problems this evening bmanning (Sep 18)
- Re: .ORG problems this evening E.B. Dreger (Sep 18)
- Re: .ORG problems this evening just me (Sep 18)
- Re: .ORG problems this evening Alex Bligh (Sep 19)
- apathy (was Re: .ORG problems this evening) Todd Vierling (Sep 19)
- RE: apathy (was Re: .ORG problems this evening) Eric Germann (Sep 19)
- Re: apathy (was Re: .ORG problems this evening) Rodney Joffe (Sep 19)
- Re: apathy (was Re: .ORG problems this evening) Todd Vierling (Sep 19)
- Re: apathy (was Re: .ORG problems this evening) Richard A Steenbergen (Sep 19)
- Re: .ORG problems this evening E.B. Dreger (Sep 18)
- Re: .ORG problems this evening Majdi S. Abbas (Sep 18)
- Re: .ORG problems this evening Todd Vierling (Sep 18)