Re: [Asrg] Another dnsbl draft, now standards flavored
2008-07-29 10:32:49
On Jul 29, 2008, at 10:26 AM, Chris Lewis wrote:
Tony Hansen wrote:
My take:
Think of DNSxL as an exercise in steganography: A few bits of
information are encoded into something that looks an awful lot like
an IP address and can be carried over a channel intended to
transmit IP addresses. Otherwise it's an opaque value.
The choice of 127.0.0.0/8 and ANY sort of range in the IPv6 address
space is truly irrelevant. These are not IP addresses; they just
look like IP addresses.
Correct. But having the DNSBL return addresses that may actually be
in use means that you can't tell the difference between a correctly
operating DNSBL and an ordinary DNS server returning real IP
addresses.
Eg: a DNSBL domain gets typo-squattered (or reclaimed), whereupon
the domain owner puts in wildcarded A records pointing at their
click thru advertising page. In ipv4 space, there is a not
insignificant fraction of DNSBL clients that will treat this as
meaning all IPs are listed. The slightly better ones know that
non-127/8 returns should be ignored.
We need the same safety net in ipv6.
You'd only need the same safety net for IPv6 responses if you decided
to have a DNSBL return IPv6 responses, which I don't think anyone is
seriously suggesting, are they?
Otherwise, it returns an A record and, after you've gone through the
step of converting the IP address you're querying to a hostname,
everything behaves identically for v4 and v6 queries.
Cheers,
Steve
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- Re: [Asrg] Another dnsbl draft, now standards flavored, (continued)
- Re: [Asrg] Another dnsbl draft, now standards flavored, John Levine
- Re: [Asrg] Another dnsbl draft, now standards flavored, Frank Ellermann
- Re: [Asrg] Another dnsbl draft, now standards flavored, John Levine
- Re: [Asrg] Another dnsbl draft, now standards flavored, der Mouse
- Re: [Asrg] Another dnsbl draft, now standards flavored, Walter Dnes
- Re: [Asrg] Another dnsbl draft, now standards flavored, Frank Ellermann
- Re: [Asrg] Another dnsbl draft, now standards flavored, Walter Dnes
- Re: [Asrg] Another dnsbl draft, now standards flavored, der Mouse
- Re: [Asrg] Another dnsbl draft, now standards flavored, Tony Hansen
- Re: [Asrg] Another dnsbl draft, now standards flavored, Chris Lewis
- Re: [Asrg] Another dnsbl draft, now standards flavored,
Steve Atkins <=
- Re: [Asrg] Another dnsbl draft, now standards flavored, der Mouse
- Re: [Asrg] Another dnsbl draft, now standards flavored, John Levine
- Re: [Asrg] Another dnsbl draft, now standards flavored, SM
Re: [Asrg] Another dnsbl draft, now standards flavored, Larry M. Smith
Re: [Asrg] Another dnsbl draft, now standards flavored, SM
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