On Sat, Feb 14, 2004 at 05:41:29PM -0500, Philip Gladstone wrote:
- The resulting addresses MUST have PTR records, and these PTR records
MUST match the host. The following lookups will still work but are
discouraged:
somehost -> a.b.c.d; a.b.c.d -> otherhost; otherhost -> a.b.c.d
The following will NOT result in a valid lookup:
somehost -> a.b.c.d; a.b.c.d -> otherhost; otherhost -> p.q.r.s
This implies that I cannot run a mail server on a cable modem. This is
uncool. The reason is that the a.b.c.d -> otherhost which typically
doesn't map to anything.
Why?
d.c.dsl-net-a-b.someprovider.tld A a.b.c.d
d.c.b.a.in-addr.arpa PTR d.c.dsl-net-a-b.someprovider.tld.
Next, you register whatever.tld and setup DNS:
whatever.tld MX 0 d.c.dsl-net-a-b.someprovider.tld
whatever.tld TXT "v=spf1 MX -all"
This way, you have a perfectly legal setup, even according to the
proposed items in the BCP.
You have to allow for the case where the a.b.c.d is administratively
controlled by someone other than the system administrator.
I have. If your provider sucks and can't get DNS right, well, their
users aren't complaning loudly enough.
cheers,
Alex
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