Re: Queries are "lost" ??

Serge Tchesmeli <zztchesmeli@echo.fr> wrote:
> Hello to everybody.

> First of all, excuse my english, i'm a french user.

> My problem:

> Our compagny use amanda to make backup of approximalty 400 servers.
> When amanda job start, it make two DNS query: a "hostname" and a "reverse".

> Since now 2 month, everyday we have some hosts that have not been backuped by
> amanda because the DNS query had failed. Hosts are never the sames, and the
> query failed on direct or reverse query.

> I have mirrored the switch port where my dns server is pluggued, and i have
> captured all packets and what i see is:

> - amanda query is captured
> - DNS server don't answer to this query

> I have put "severity debug 9" on all named channel logging and i do not see
> any kind of error in logs.

> So my question:
> - Can bind "miss" or "refuse" some query because of "overload?" and if yes,
> can we log that?

> system info:

> - bind 9.2.4 RC2, chrooted
> - Linux 2.4.20-13.7custom #3 SMP (BI PIII 500Mhz, 1Go RAM)
> - Red Hat Linux release 7.2 (Enigma)

> Bind stats:

> --- Statistics Dump --- (1102608300)
> +++ Statistics Dump +++ (1102608600)
> success 16645093
> referral 1
> nxrrset 583904
> nxdomain 3921475
> recursion 138245
> failure 23020
> --- Statistics Dump --- (1102608600)
> +++ Statistics Dump +++ (1102608900)
> success 16674759
> referral 1
> nxrrset 585073
> nxdomain 3929061
> recursion 138492
> failure 23034
> --- Statistics Dump --- (1102608900)

> Ask me if you need more info.
> thanks

> Serge

Is the nameserver heavily loaded ?
Does it have free memory ?
Does the amanda server have multiple nameservers in /etc/resolv.conf ?
is your dns-environment correct ? I see 20% of all queries gives nxdomain ...




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