Sam Pointer sam.pointer at
Thu Oct 24 13:56:49 UTC 2002

Thankyou all.

Have already blackholed the offending IP addresses and contacted the dns
contact for the zone. Hopefully they will resolve it for themselves when
they see that some super-spiffing MS service that relies on AD is broken :)

-----Original Message-----
From: Len Conrad [mailto:LConrad at]
Sent: 24 October 2002 14:52
To: bind-users at
Subject: Re: DoS?

>I am getting bombarded with entries in my query and syslog 
files. Here is a
>small subset:
>BIND query.log:
>client query: IN SRV

Some MS GUI jockey randomly clicking on radio buttons has 
screwed up his MS 

>client query: IN SRV

These are queries for MS Active Directory services, located via 
SRV records.

The underscore domain names, their queries, and SRV records are 
intranet items that should never leak out to public internet.

Like MS's other famous screw up of making all w2k/xp OS's 
"register" their 
A records with DNS (ie, run as dynamic zone updaters) by 
default, these SRV 
thingies are harmless other than filling up your logs and wasting your 

In bind,

options {blackhole {address_match_list } ; };

... will minimize the effects on your BIND machine.


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