On Tue, 6 Sep 2005, Commerco WebMaster wrote:
I'm probably missing something here. If so, sorry to be obtuse and
please clue me in.
A host with multiple IP addresses and multiple names
is no problem for DNS or for EHLO checking. DNS supports multiple
A records for a name and multiple PTR records for an ip.
For example:
;EHLO name:
jupiter.example.com IN A 10.0.0.1
jupiter.example.com IN A 10.1.0.1
jupiter.example.com IN A 10.2.0.1
;interface names
jupiter0.example.com IN A 10.0.0.1
jupiter1.example.com IN A 10.1.0.1
jupiter2.example.com IN A 10.2.0.1
And EHLO would be jupiter.example.com.
Although checking EHLO doesn't use them, you can also make PTR return
multiple names for an IP:
$ORIGIN 10.in-addr.arpa.
1.0.0 IN PTR jupiter.example.com.
1.0.0 IN PTR jupiter0.example.com.
1.0.1 IN PTR jupiter.example.com.
1.0.1 IN PTR jupiter1.example.com.
1.0.2 IN PTR jupiter.example.com.
1.0.2 IN PTR jupiter2.example.com.
The only "problem" is that the poster doesn't feel that mail servers
should be required to have consistent DNS records.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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