bind forward to rbldns server intermittently fails
Mark Andrews
Mark_Andrews at isc.org
Sun Nov 19 21:49:40 UTC 2006
> Hi
> I am using bind 9.2.4 on Centos 4.2
> We run a fairly high traffic Antispam service with 6-7 million mails
> hitting a day ( 14 load balanced servers each serving upto 35k
> mails/hour )
>
> For checking antispam , we use a "local" rbldns server running rbldns on
> port 530 and every scan server is configured to forward all rbl-zones to
> the rbldns server
>
> so in my named.conf I have
> zone "xbl.spamhaus.org" IN {
> type forward;
> forward first;
forward only;
> forwarders {
> 192.168.2.2 port 530;
> };
> };
>
> The hits on the rbldns server would be around 1000qps
>
> Everything seems to work perfectly fine .. but sometimes all of sudden
> the named server seems to have failed When I "dig" for a listed ip I get
> a negative response. I restart bind and then for the same ip I get
> positive response
>
> Any ideas how do I debug this
>
> Thanks
> Ram
>
>
>
>
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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