Full Disclosure mailing list archives
Re: Reverse dns
From: Valdis.Kletnieks () vt edu
Date: Thu, 10 Mar 2005 16:35:49 -0500
On Thu, 10 Mar 2005 11:30:51 CST, Paul Schmehl said: give details. I'll give you this much. We're having a
philosophical disagreement about the value of disallowing reverse dns for hosts on our network. It's the ancient security by obscurity discussion. My concern is that we should not disable dns when (or if) it's required. Obviously we would not disable it for the MX hosts, but I'm unclear what (if anything) the RFC requirements are. Absent any requirements, there's not cogent argument for *not* doing it, with the aforementioned exceptions.
The security via obscurity is very slim - remember that if they're looking for the PTR entry, they *already* have the IP address.. One good reason to put the PTR out there is because it allows sanity-checking of your DNS - if you have 'foo.example.com A 10.10.100.1', then there should be a '1.100.10.10.in-addr.arpa PTR foo.example.com' to match. If you fumble-finger and get 'foo.example.com A 10.10.100.10', you can catch it because when you look up the PTR, you find '10.100.10.10.in-addr.arpa PTR bar.example.com'.
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Current thread:
- Re: Reverse dns, (continued)
- Re: Reverse dns Vincent Archer (Mar 10)
- Re: Reverse dns Paul Schmehl (Mar 10)
- Re: Reverse dns Duo (Mar 10)
- Re: Reverse dns Paul Schmehl (Mar 10)
- Re: Reverse dns Duo (Mar 10)
- Re: Reverse dns Danny (Mar 10)
- Re: Reverse dns (whether you want it or not) TheGesus (Mar 10)
- RE: Re: Reverse dns (whether you want it or not) Edward Ray (Mar 11)
- Re: Reverse dns (whether you want it or not) Dave Korn (Mar 11)
- Re: Re: Reverse dns (whether you want it or not) Danny (Mar 11)
- Re: Reverse dns Paul Schmehl (Mar 10)
- Re: Reverse dns Valdis . Kletnieks (Mar 11)
- Re: Reverse dns Simon Biles (Mar 11)
- Re: Reverse dns Vincent Archer (Mar 10)
- Re: Reverse dns Paul Schmehl (Mar 10)
- Re: Reverse dns Valdis . Kletnieks (Mar 11)