Full Disclosure mailing list archives
Re: Reverse dns
From: Andrei Zlate-Podani <azlate () bitdefender com>
Date: Thu, 10 Mar 2005 19:10:15 +0200
Paul Schmehl wrote:
Is there an RFC *requirement* for reverse dns?
RFC 1035 doesn't state that IN-ADDR.ARPA lookups are optional. <snip> 3.5. IN-ADDR.ARPA domain The Internet uses a special domain to support gateway location and Internet address to host mapping. Other classes may employ a similar strategy in other domains. The intent of this domain is to provide a guaranteed method to perform host address to host name mapping, and to facilitate queries to locate all gateways on a particular network in the Internet. </snip>
I've been looking through the RFCs and I can't find it. Some folks think reverse dns should be completely disabled. I know for sure that this will break email, because many mail servers won't talk to a server that doesn't reverse. Tcpdump also doesn't like hosts that won't reverse.What I'm looking for is a standard (RFC) that states that enabling reverse lookups is *required* or reverse lookups are *optional*. If they're optional, then reverse could be disabled for most hosts.I'm also looking for a list of things that *break* when you disable reverse (e.g. mail).
I would say that reverse dns lookup is at most as "harmful" as normal lookup. It makes a lot of tools more user-friendly. Even trace route uses this technique to display the names of the internet gateways.
RULES FOR RESPONDING:1) "Reverse is a good thing" is not an answer. Neither is "Reverse is a bad thing". 2) Opinions are not useful - stick to facts only - chapter and verse please.3) All replies to the list please - others will find this useful as well. Paul Schmehl (pauls () utdallas edu) Adjunct Information Security Officer The University of Texas at Dallas AVIEN Founding Member http://www.utdallas.edu _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://www.secunia.com/
-- Ignorance more frequently begets confidence than does knowledge. --- Charles Darwin -- This message was scanned for spam and viruses by BitDefender. For more information please visit http://linux.bitdefender.com/ _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://www.secunia.com/
Current thread:
- Re: Reverse dns, (continued)
- 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 Valdis . Kletnieks (Mar 11)
- Re: Reverse dns Simon Biles (Mar 11)
- Re: Reverse dns Paul Schmehl (Mar 10)
- Re: Reverse dns Valdis . Kletnieks (Mar 11)
- RE: Reverse dns Paul Schmehl (Mar 10)