nanog mailing list archives
Re: Performance Issues - PTR Records
From: bmanning () vacation karoshi com
Date: Tue, 8 Nov 2011 11:11:15 +0000
On Tue, Nov 08, 2011 at 10:05:12PM +1100, Mark Andrews wrote:
In message <4EB8F028.8040607 () dds nl>, Seth Mos writes:On 7-11-2011 14:46, sthaug () nethelp no wrote:The practice of filling out the reverse zone with fake PTR record started before there was wide spread support for UPDATE/DNS. There isn't any need for this to be done anymore. Machines are capable of adding records for themselves.How do I setup this for DHCPv6-PD? Say, I delegate 2001:db8:42::/48 to the end user. Should I delegate reverse DNS as well? If so, to whom? Or is it the CPEs responibility to dynamically add records for whatever addresses it sees on the internal LAN(s)? Are there CPEs capable of doing this? Or will the end systems themselves do the update against my DNS server? If so, how do I authenticate that?With my ISP hat on, I find the idea of customer CPEs updating their own PTR records to be completely unacceptable. So I guess I'll either live without the reverse DNS, or use a name server that can synthesize answers on the fly.That seems like a really nice feature, create a reverse record to spoof a mail server and the reverse DNS will match up. If the domain does not employ SPF it will look legit, forward and reverse won't match up ofcourse. Not sure how many mailservers have issues with that if the reverse matches up. Sounds like a fine way to employ a spam botnet.Sounds like FUD. Who has trusted the contents of a PTR record in the last 2 decades?Regards, Seth-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
the same people who trust the contents of an A record in the last 2 decades. /bill
Current thread:
- Re: Performance Issues - PTR Records, (continued)
- Re: Performance Issues - PTR Records Jimmy Hess (Nov 07)
- Re: Performance Issues - PTR Records Mark Andrews (Nov 06)
- Re: Performance Issues - PTR Records Brett Watson (Nov 06)
- Re: Performance Issues - PTR Records Bjørn Mork (Nov 06)
- Re: Performance Issues - PTR Records sthaug (Nov 07)
- Re: Performance Issues - PTR Records Leigh Porter (Nov 07)
- Re: Performance Issues - PTR Records Bjørn Mork (Nov 07)
- Re: Performance Issues - PTR Records Leigh Porter (Nov 07)
- Re: Performance Issues - PTR Records Seth Mos (Nov 08)
- Re: Performance Issues - PTR Records Mark Andrews (Nov 08)
- Re: Performance Issues - PTR Records bmanning (Nov 08)
- Re: Performance Issues - PTR Records Jeroen Massar (Nov 08)
- Re: Performance Issues - PTR Records Mark Andrews (Nov 08)
- Re: Performance Issues - PTR Records Jeroen Massar (Nov 08)
- RE: Performance Issues - PTR Records Leo Vegoda (Nov 09)
- Re: Performance Issues - PTR Records Mark Andrews (Nov 09)
- Re: Performance Issues - PTR Records Jimmy Hess (Nov 04)
- Re: Performance Issues - PTR Records Jay Ashworth (Nov 04)
- Re: Performance Issues - PTR Records Blake Hudson (Nov 09)