fixing insecure email infrastructure (was: Re: [eweek article]
maex-lists-nanog at Space.Net
Tue Jan 25 15:27:03 UTC 2005
On Tue, Jan 25, 2005 at 09:41:08AM +1100, Mark Andrews wrote:
> Lots. I'm sure that there are lots of ISPs/IAPs on NANOG
> that do RFC 2317 style delegations for their customers.
How many is lots?
And how often do the IP addresses of (outgoing) Mailservers change within
a subnet? None of ours has changed in the last 10 years and our
customers (mainly business customers) usually never change them, either.
> Every one of them would need to upgrade their servers to
> support DNAME. Their clients would also need to upgrade
> their servers to support DNAME as they should be stealth
> servers of the parent zone, to allow local lookups to work
> when the external link is down.
If MTAMARK requires DNAME then RFC 2317 style delegations would require
them, too. None of which is true.
1 CNAME 1.0/22.214.171.124.in-addr.arpa.
works exactly the same way
_send._smtp._srv.1 CNAME _send._smtp._srv.1.0/126.96.36.199.in-addr.arpa.
does. No special magic required. One can even use BINDs $GENERATE
statement for that.
Unless I am missing something I don't know of any RFC that prohibits that.
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