Funny cache records
Ladislav Vobr
lvobr at ies.etisalat.ae
Sun Feb 22 03:30:42 UTC 2004
Barry Margolin wrote:
>>$ORIGIN msn.COM.
>>;help 243 IN SOA localhost. postmaster.localhost. (
>>; 2002100100 3600 1800 604800 3600 );msn.com.;NXDOMAIN ;-$ ;Cr=auth
>>[206.13.29.12]
>>www 2376 IN SOA localhost. postmaster.localhost. (
>> 2002100100 3600 1800 604800 3600 ) ;Cr=auth [206.13.29.12]
>>; 2376 IN A localhost. postmaster.localhost. (
>>; 2002100100 3600 1800 604800 3600 );www.msn.com.;NODATA ;-$ ;Cr=auth
>>[206.13.29.12]
>
>
> The entries marked ";-$" are negative cache entries. The "IN A"
> indicates that this is the type of record that could not be found; the
> rest of the data is from the SOA record for the containing zone.
>
> I can't explain where these bogus cache entries came from, though. When
> I query 206.13.29.12 (dns1.lsanca.sbcglobal.net) it appears to know that
> www.msn.com is delegated to various msft.net servers, and it knows the
I have asked some time back im bind-ml, why the referencing parent DNS
server information is not available anymore in the bind9.2.2 dump_db, or
perhaps I just couldn't discover it? I believe it is very useful in
troubleshooting daily cases similar to this.
Ladislav
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