Re: DNS ACL ?

["Thor (Hammer of God)" <thor () hammerofgod com>]

Exchange (and IIS SMTP) use TCP 53 for DNS queries as well, not just UDP. 
Depending on the number of SMTP virtual servers doing DNS lookups for 
delivery, what one considers "general" will vary.

t

----- Original Message ----- 
From: "John Hally" <JHally () epnet com>
To: <pen-test () securityfocus com>
Sent: Friday, November 11, 2005 5:35 AM
Subject: DNS ACL ?


> Hello All,
>
>
>
> I need a sanity check regarding DNS ACLs.  For external facing DNS servers
> you need to allow only udp/53 inbound, correct?  I know tcp/53 is used for
> zone transfers and requests/replies greater than a certain size, but they
> shouldn't typically happen for general dns queries correct?
>
>
>
> Thanks in advance!
>
>
>
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Audit your website security with Acunetix Web Vulnerability Scanner: 

Hackers are concentrating their efforts on attacking applications on your 
website. Up to 75% of cyber attacks are launched on shopping carts, forms, 
login pages, dynamic content etc. Firewalls, SSL and locked-down servers are 
futile against web application hacking. Check your website for vulnerabilities 
to SQL injection, Cross site scripting and other web attacks before hackers do! 
Download Trial at:

http://www.securityfocus.com/sponsor/pen-test_050831
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