On Oct 14, 2004, at 8:31 AM, guy wrote:
In sections: B.1 Simple Examples
Please explain why this is true:
-- sending host 10.0.0.4 fails (reverse IP is not valid)
Is it because the IP address is an RFC-1918 address?
No. It fails because first the PTR record is looked up:
$ORIGIN 0.0.10.in-addr.arpa.
4 PTR bob.example.com.
Then bob.example.com's A record is looked up:
$ORIGIN example.com.
bob A 192.0.2.66
Since 192.0.2.66 != 10.0.0.4, there is no validated domain name for
10.0.0.4. Therefore, there is no validated domain name that is within
example.com. And so, the "ptr" directive doesn't match. The next
directive is "-all", which does match, and the IP fails the test.
- Mark