deploying DNS in large ISP
Brad Knowles
brad.knowles at skynet.be
Fri Jul 6 01:03:46 UTC 2001
At 2:41 PM +0000 7/5/01, Barry Margolin wrote:
> We're currently using static routes on the upstream routers, so removing a
> server requires manual configuration changes by our network operators. It
> would probably be better to run gated on the server so that it would
> advertise itself, and the advertisement would go away automatically if the
> server crashes. But when we set this up we decided to go the simple route
> (no pun intended). Even if we ran gated, we'd need to be able to disable
> the route if the system stayed up but named died.
If you used a set of machines behind L4 load-balancing switches,
and published the address(es) of the switches (perhaps anycasting
them), you wouldn't have this problem. Indeed, I believe that it is
this mix of paired high-availability features that Nominum makes use
of in their GNS.
I understand that some of the root nameservers are actually
paired machines sharing an anycast IP address and using OSPF, while
others are behind some sort of load-balancing switch. The
combination of the two techniques should be very powerful.
--
Brad Knowles, <brad.knowles at skynet.be>
/* efdtt.c Author: Charles M. Hannum <root at ihack.net> */
/* Represented as 1045 digit prime number by Phil Carmody */
/* Prime as DNS cname chain by Roy Arends and Walter Belgers */
/* */
/* Usage is: cat title-key scrambled.vob | efdtt >clear.vob */
/* where title-key = "153 2 8 105 225" or other similar 5-byte key */
dig decss.friet.org|perl -ne'if(/^x/){s/[x.]//g;print pack(H124,$_)}'
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