Search Again: Re: Failed to Lookup SOA From: Mia''s Virtual Post Office Date: Wednesday, May 30, 2001 Time: 4:27:15 am 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