On Friday May 13 2005 6:58 pm, Monique Y. Mudama wrote: > "Does your mail server have a PTR entry in your DNS zone file? [...] > ... but that doesn't make sense to me. I have different A and MX > records for the domain, specifically so that I can use a hosted web > service while serving mail on a different machine. If that weren't > perfectly legit, why even have the concept of an MX record?
Well, a PTR is a PoinTeR record. Here's some examples from my
internal domain, network.ursine.ca, as well as it's reverse lookup
zone, 0.168.0.in-addr.arpa (before dynamic updates make it
unreadable):
$ORIGIN .
$TTL 600 ; 10 minutes
network.ursine.ca IN SOA ursine.ca. hostmaster.ursine.ca. (
2005051305 ; serial
600 ; refresh (10 minutes)
600 ; retry (10 minutes)
2419200 ; expire (4 weeks)
600 ; minimum (10 minutes)
)
NS ursine.ca.
$ORIGIN network.ursine.ca.
broadcast A 192.168.0.255
TXT "Broadcast address"
network A 192.168.0.0
TXT "Network address"
and the reverse zone...
$ORIGIN .
$TTL 600 ; 10 minutes
0.168.192.in-addr.arpa IN SOA ursine.ca. hostmaster.ursine.ca. (
2005051305 ; serial
1200 ; refresh (20 minutes)
600 ; retry (10 minutes)
2419200 ; expire (4 weeks)
1200 ; minimum (20 minutes)
)
NS ursine.ca.
$ORIGIN 0.168.192.in-addr.arpa.
0 PTR network.ursine.ca.
1 PTR gateway.ursine.ca.
255 PTR broadcast.ursine.ca.
The reverse zone is what gets you to the point where you can do this:
[EMAIL PROTECTED]:~$ host 192.168.0.255
255.0.168.192.in-addr.arpa domain name pointer broadcast.ursine.ca.
You need to create a reverse zone for your network.
--
Paul Johnson
Email and Instant Messenger (Jabber): [EMAIL PROTECTED]
http://ursine.ca/~baloo/
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