Search Again: Re: Failed to Lookup SOA From: Tony Date: Wednesday, May 30, 2001 Time: 10:40:29 am I have the same problem except that when the slave starts-up it never shows the "Failed to lookup SOA" errors. It only shows up after the slave has been up for several days. I have about 200 zones. >Men & Mice Support said: > >>At 5:59 PM -0500 5/29/01, Mia's Virtual Post Office wrote: > >>How come my secondary has a bunch of "Failed to lookup SOA" errors? I >>>notice this for every domain the primary has.. Any ideas? >> >>Think about this: What happens when your slave (secondary) server starts up? >> >>- Initialize memory. >>- Load any master zones. >>- Load cached slave zones. >>- Check master server(s) of slave zones for new versions. > >Understood... >> >>It does that last step for all of them at once. It expects a snappy >>answer from the master server. If the answer doesn't come quickly >>enough, some number of these checks will fail. The server will then >>retry those zones at the designated retry interval. > >So what you are telling me then, is that QDNS is not robust enough to >handle this? >> >>If you have 900 - 1000 zones, as I recall you having, this amounts to >>a denial-of-service attack against the master server. There's not >>much you can do about this. (Bind behaves in the same way, I believe.) > >Yes we are back over 1000 on this box again. Not sure if I agree on the >BIND end, but I have not seen that happen as of yet, so I cannot be sure. >> >>The real problem is, when all those failures get retried, you get a >>(somewhat smaller) denial of service attack again. If 100 of them >>succeed each time, by the time the 4th retry interval comes around, >>you may still have 500 zones in failure mode. With the default >>refresh and retry intervals (8 hours and 2 hours), this is also when >>those first 100 successful zones are also retried. > >Then this could perhaps explain our periodic crashes? Hopefully I will >get some time to get QDNS updated to 3.5 here, and we shall see what >differences if any we experience. >> > >thanx again! > >jer (jer@mia.net) > >Bella Mia, Inc. >High Speed Wireless - www.dslone.com >Web Hosting and Colocation - www.hostdrive.com >Nation Wide Dialup 4 years and running - www.mia.net > > > >NetZero = What this company will "NET" --- "ZERO"

Messages In This Thread: Failed to Lookup SOA by Mia''s Virtual Post Office on May 30, 2001 at 2:18:19 am Re: Failed to Lookup SOA by Men & Mice Support on May 30, 2001 at 2:44:45 am Re: Failed to Lookup SOA by Mia''s Virtual Post Office on May 30, 2001 at 4:27:15 am Re: Failed to Lookup SOA by Tony on May 30, 2001 at 10:40:29 am Re: Failed to Lookup SOA by Men & Mice Support on May 30, 2001 at 11:19:26 pm Re: Failed to Lookup SOA by Men & Mice Support on May 30, 2001 at 11:19:44 pm failed to lookup soa by rashantha de silva on May 29, 2002 at 6:34:57 am Re: failed to lookup soa by rashantha de silva on May 29, 2002 at 9:05:51 am Re: failed to lookup soa by Men & Mice Support on May 29, 2002 at 12:33:56 pm Re: failed to lookup soa by rashantha de silva on May 29, 2002 at 1:14:08 pm