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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