WOW! ... weird
Roy Arends
Roy.Arends at nominum.com
Sat Apr 7 02:33:51 UTC 2001
On Sat, 7 Apr 2001, Ryan Crouch wrote:
> VERY odd behaviour, I smell UFO's
>
> I have run BIND nameservers for 4 years now, and I have never seen what I
> saw yesterday.
>
> The nameservers in question yesterday hosted 600+ domains. All of a sudden
> the name resolution stopped, and it was instaneous. There was no
> modification of named.conf's or zone files. The servers simply didn't even
> attempt to resolve. I killed NS2's zone files and restarted it to init the
> transfer. That happened without a problem. NS2 started to work flakily but
> would take minutes to resolve hosts. NS1, was a nightmare. I removed,
> zone's, restored named.conf's from old backups, made a cacheing only
> configuration, rebuilt BIND from source code, restored old binarys. Nothing
> happened. The machine simply used 100% CPU. All of a sudden, it started
> working, without a problem. I added forwarders to the configuration and boom
> .... it started using 100% again. Took the forwarders out, and there wasn't a
> problem. When I went back to NS2 during the rebuild of ns1 ... it was
> working fine.
>
> 2 Hours later, it was all ok.
>
> Funny though, the CPU utilization of our Cisco Core router jumped 17
> percent, and a frame relay downstream client's traffic jumped from 15kbit,
> to 1.6mbit.
>
> Any Ideas on that ? If none thats ok, just letting you know what a fun day I
> had ;)
Which OS ?
Which Nameserver ?
Which version of the nameserver ?
Config ?
Logs ?
DNS architecture ?
We might be able to give you Any Ideas on that.
Regards,
Roy Arends
Nominum
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