Search Again: Re: How DNS works ? From: Len Conrad Date: Friday, November 1, 2002 Time: 3:09:50 pm >1) Due I think to an obviously broken server somewhere, somebody began >querying my servers for the zone over and over. (about 600 Q's per second) >OK, so I had that that guy killed at my ISP's router. it's broken, or malicious >2) even after that, our DNS traffic was hugely higher than normal. >So I re-added the zone, but gave it an ip of 127.0.0.1 and no MX record ok, or just block the querying ip at your edge router. >That reduced the dns traffic to the normal level. > >Is it normal or typical for a dns server to keep trying repeatedly to get a >zone if the authoritative servers have no answer? of course not. 5 secs is the usual query timeout for, eg, BIND. Len

Messages In This Thread: How DNS works ? by Aaron Lynch on Nov 1, 2002 at 11:00:50 am Re: How DNS works ? by Len Conrad on Nov 1, 2002 at 3:09:50 pm Re: How DNS works ? by Men & Mice Support on Nov 1, 2002 at 4:03:08 pm Re: How DNS works ? by Len Conrad on Nov 1, 2002 at 6:05:44 pm Re: How DNS works ? by Aaron Lynch on Nov 1, 2002 at 9:10:53 pm