On Wednesday 24 February 2010 11:11, Daniel B. Thurman wrote: I'd either cname one address or the other. > I am trying to get a handle on how to properly > assign DNS PTR records, given these conditions: > > 1) Single machine containing: > a) DNS Server > b) Sendmail Server > > > Forward zone contains: > ====================== > $TTL 172800 > @ IN SOA ns1.domain.com. admin.domain.com. ( > 3818 ; serial > 3H ; refresh > 15M ; retry > 1W ; expiry > 1D ) ; minimum > ; ==========[Nameservers]================= > @ IN NS ns1.domain.com. > ; ==========[Mail Exchangers]============= > @ IN MX 10 mx1.domain.com. > ; ==========[Machines]==================== > ns1 IN A 10.1.0.1 > mx1 IN A 10.1.0.1 > [...] > > > Reverse zone contains: > ====================== > $TTL 172800 > @ IN SOA ns1.domain.com admin.domain.com ( > 3818 ; serial > 3H ; refresh > 15M ; retry > 1W ; expiry > 1D ) ; minimum > ;============ Top-Level ================= > @ IN NS ns1.domain.com. > ;============ PTRS ====================== > 1 IN PTR ns1.domain.com. > 1 IN PTR mx1.domain.com. > [...] > > > The problem here is assigning the PTR, since > only ONE reverse IP address is allowed. In > the above case, which will it be, ns1.domain.com > or mx1.domain.com? Discovery led to the last > "scanned" entry, which is mx1.domain.com > > Why is this a potential problem? > + One that I can think of, is security verification > such as some programs do a reverse IP check to reduce > phishing/spamming? > > How is this to be properly handled? > + Separate out DNS and Sendmail services to it's > own machine as hinted in "example.org"? > > Is it possible/sensible to have DNS and Sendmail on > the same machine? > > Thanks! > Dan
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