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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