Search Again: Re: Unreasonable Zone Transfers? From: Global Homes Webmaster Date: Friday, July 6, 2001 Time: 9:57:53 am On 07/06/01 at 10:51, Juergen Schreck wrote: > Hi, > > I have a general question for this list. > > A while back I asked about what parameter determines at what intervals a > secondary nameserver issues zone transfers from a primary because my ISP was > doing transfers every 10 minutes - which didn't match any of my parameters. > > Now today I get a message from they DNS support group that the 10 minute > interval is set on their site and that's why they transfer zones that often. > It total disregards the REFRESH in my zone-info. Is that reasonable? I've > got only about 15 zones right now, but there will definitely be more. Seems > like an awful lot of unnecessary stress... > > What's worse, they are issuing zone transfers from 3 secondaries (for > redundancy on their upstream connections I suppose). So every 10 minutes I'm > getting hit with 45 transfers. > > Can they do that? Aren't there some rules to be followed here? I suppose I > could restrict zone-transfers to just one of the IP's to cut down on the > multiple servers, but still - every 10 minutes? Should I be looking for > alternative secondaries? What are my options? I think I'd be looking for alternative secondaries if I were you. Unnecessary zone transfers at ten minute intervals seem entirely unreasonable to me, unless maybe you've got zones that change daily? Didn't think so... It might not seem too unreasonable if they were just checking your zones' serial numbers every ten minutes and only getting zone transfers when the serial has changed (which is the other thing they're supposed to do besides honoring your refresh value). But three servers doing zone transfers every ten minutes for zones that aren't changing is an awfully big waste of bandwidth. And I assume that they're doing secondary service for more than just your zones? In any case, I'm a little surprised that an ISP would be willing to waste the bandwidth on it. After all, they're not only wasting their own b/w, but also b/w that you pay for. Maybe they don't really have a DNS admin who knows what he's doing. Christopher Bort | cbort@globalhomes.com Webmaster, Global Homes | webmaster@globalhomes.com <http://www.globalhomes.com/> | PGP public key available on request

Messages In This Thread: Unreasonable Zone Transfers? by Juergen Schreck on Jul 6, 2001 at 8:52:13 am Re: Unreasonable Zone Transfers? by Global Homes Webmaster on Jul 6, 2001 at 9:57:53 am