Re: What are the SMTP rules for sending mail to FreeBSD

[Len Conrad]

Easier said than done.  I've been assigned 66.45.116.136/29 by the ISP.

.136 is not a power of 2 which is required for classless reverse delegation. It should be .132/29 or .140/29

I control DNS for quadtelecom.com, but I don't control the reverse lookup. I'd like to know the exact algorithm in use, so that I can negotiate with my ISP.

For sub-Class C delegation, see the DNS & BIND book, 4th edition.

1. Your ISP creates a arbitrarily named node in the reverse domain and delegates the zone to you:

tabak.116.45.66.in-addr.arpa. NS ns1.quadtelecom.com.
tabak.116.45.66.in-addr.arpa. NS ns2.quadtelecom.com.

2. then for each ip in your tabak subzone he create a CNAME in his NS:

133.116.45.66.in-addr.arpa. CNAME 133.tabak.116.45.66.in-addr.arpa.
.
.
.
139.116.45.66.in-addr.arpa. CNAME 139.tabak.116.45.66.in-addr.arpa.

3. then in your NS:

133.tabak.116.45.66.in-addr.arpa. PTR name.what.ever.
.
.
.
139.tabak.116.45.66.in-addr.arpa. PTR hostname.some.dom.

The rule is that the parent domain's CNAME rdata field must, of course, be matched the child domain's PTR owner field.

For example, how are are hosts with multiple IP adresses handled?

put only one PTR per ip.

Len


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