On Fri, Oct 17, 2003 at 03:44:17PM -0400, Meng Weng Wong wrote:
|
| 2) the PI lookup zone.
|
| If the domain defines the PI mechanism, and if the IP is 1.2.3.4,
| we would perform the query 4.3.2.1.in-addr._smtp_client.DOMAIN
|
| 2) If we get rid of the subdomain, how do we design reversed-IP lookups?
|
| 4.3.2.1.DOMAIN? But maybe that space is already populated.
| Underscore labels are nice; they're like secret dimensions.
|
| Besides, even if we get a new RR type, that doesn't make the problem
| go away.
|
We have an alternative that makes underscore subdomains go away, at the
cost of introducing other problems.
Under the current design we do an A query for
1.2.0.192.in-addr._smtp_client.example.com.
Robert has suggested this:
Instead, add a TXT record alongside the PTR record for
1.2.0.192.in-addr.arpa; it would contain "v=spf1 pi=example.com"
That makes the underscore labels go away.
Under this proposed scheme, even if the PTR record for
1.2.0.192.in-addr.arpa were mx.example.org, a directive "pi:example.com"
would look up the TXT record, find "pi=example.com", and match.
There are pros and cons either way.
If people really feel strongly about not using an _smtp_client
subdomain, this is one alternative. What do people feel about this?
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