Re: How do you get off ORBS nowadays?
- Date: Mon, 16 Jul 2001 13:11:19 +0200
- Organization: ZID / Uni Wien - Tel: 4277/14057
Gunnar Lindberg wrote:
> I'm not going to claim DNS expertise, but it seems to me that
> NXdomain(relays.orbs.org)
> responses would consume less bandidth than providing (faulty) data.
You cannot attach a 7 days TTL to "nothing". This issue has been
discussed and announced in spamtools - see
http://www.abuse.net/spamtools.html - a list that you might be
interested in anyway. Unfortunately, the archive does not seem to work
right now, so I'll post my copy directly:
--8<----------------------------------------------------------------------
To: spamtools@localhost
Subject: [spamtools] IMPORTANT!!! ORBS USERS PLEASE TAKE NOTE
Date: Thu, 12 Jul 2001 14:52:46 -0700
Message-ID: <70839.994974766@localhost
From: "Ronald F. Guilmette" rfg@localhost
Sender: owner-spamtools@localhost
Precedence: bulk
Reply-To: spamtools@localhost
IMPORTANT!!!
IF YOU ARE CONFIGURED TO MAKE REFERENCES TO ANY ORBS.ORG `LIST' ZONE
I STRONGLY SUGGEST THAT YOU DISCONTINUE DOING SO IMMEDIATELY, IF NOT
SOONER. FAILURE TO DO SO MAY RESULT IN SERIOUS IMPARMENT OF YOUR
E-MAIL INFLOW.
This is a public service announcement for those sites that are still
configured to perform lookups against the any or all of the following
former (and now defunct) ORBS zones:
inputs.orbs.org
outputs.orbs.org
relays.orbs.org
delayed-outputs.orbs.org
spamsources.orbs.org
spamsource-netblocks.orbs.org
manual.orbs.org
As a courtesy to Alan Brown (owner and operator of ORBS.ORG), I agreed
last year to allow one of my name servers (E-SCRUB.COM) to become one
of 11 name servers for the orbs.org zone. I agree to this because the
each of the `list' subdomains noted above was in fact a separate zone
of its own, separate and different from the base `orbs.org' zone, which
itself contained very few DNS records.
My agreement with Alan was ONLY to act as a secondary name server (one
of eleven) for the base orbs.org zone. Because of normal DNS
client-side
caching, and because of the small number of DNS records involved, I knew
for certain at the time that having my name server be one of 11
secondaries
for the base orbs.org zone would involve very little expenditure of
band-
width on my part.
The situation changed dramatically however with Alan's disabling of the
subzones mentioned above. (This occured sometime last month. I'm not
exactly sure of the date.) When disabling the `list' subzones, Alan
apparently just removed any mention of these subzones/subdomains from
the base orbs.org zone file.
Because of the way Alan disabled the former ORBS list zones, my name
server is now shouldering (at least) 1/11th of the total world-wide
DNS queries that are still being made against both the base orbs.org
zone and also against all of the former ORBS `list' subzones. This
may not sound like a lot, but in fact ot DOES represent a substantial
and noticable drain on the small amount of bandwidth I have. I should
note also that when I briefly turned on query logging in my name server
recently, I found that over 2,000 sites world wide are still making
frequent and repeated references to the former ORBS list subzones,
presumably as they attempt to check each e-mail message coming into
their mail servers.
I simply do not have the kind of bandwidth necessary to support all of
this pointless and utterly wasteful traffic. I've asked Alan multiple
times to remove my name server from the list of authoratative name
servers
for the orbs.org zone, and each time he has made up some new implausible
excuse. Alan's dog may indeed have eaten his homework, but his excuses
just aren't believable anymore. (He has had plenty of time to take care
of this. I first requested him to remove my server on June 7th, 2001,
and I have re-requested that he do that several times since. Each time
he has either failed to respond or else had presented me with some new
implausible excuse.)
I've considered various solutions to this problem, but none of them seem
particularly easy for me. I could certainly relocate my name server,
called
E-SCRUB.COM, to a different IP address, but for all I know, the DNS
query
traffic might just follow the name, rather than the IP address, so then
I'd
be right back where I started. It would also be a major pain in the ass
for
me to get an new IP for other reasons. I have already tried setting up
NS records in _my_ copy of the orbs.org zonefile (on my name server) for
all of the subzones mentioned above, and pointing all of those NS
records
at 127.0.0.1 (local loopback address) but for reason I don't fully
under-
stand, that hasn't stopped the DNS query flood to my name server either.
I'm sure that there are a number of other possible convoluted solutions
to
this problem, e.g. creating a new `host' record in DNS (and with NSI)
and
then re-jiggering all of the records for my many other domains so that
the
primary name servers for those are listed as being the new `host', but
this
seems like a lot more work than I should have to go to just because Alan
refuses to do the decent thing and because so many sites have been so
horribly
lax in removing references to the now long defunct ORBS list zones.
In light of all this, I've decided to just use a trivial and brute-force
approach to stopping all of this DNS query traffic from being sent to my
name server. As of 9 PM tonight (Pacific Daylight Time) my name server
will be configured to answer ALL `A' record queries regarding ANY name
within the orbs.org domain with an affirmative response and with the IP
address value `127.0.0.1'. Each such response will carry an extremely
long TTL, in order to insure that further queries regarding the same
name
will be put off as long as possible into the indefinite future.
An exception will be made, of course, for `A' record queries relating to
`www.orbs.org', which my name server will contine to identify as being
located at 202.61.250.235.
The implications of my plan for sites still attempting to use the
orbs.org
zones for e-mail filtering purposes should be evident. From 9 PM PDT
tonight
all such sites will begin to reject (at least) an estimated 1/11th of
their
incoming e-mail, at random. The portion of incoming e-mail given this
treatment by these sites may in fact increase, over time, as I also
intend
to delete all other NS (name server) records from my copy of the
orbs.org
zone file, leaving only my server listed as being authoritative for this
zone. (I'm actually not sure what effects this will have as the root
server will still contain a completely list of all 11 current registered
name server for the zone.)
Complaints, flames, and lawsuit threats resulting from the DNS change
that
I will make to name server this evening should be directed to Alan
Brown,
whose new/current e-mail address seems to be alanb@localhost,
and/or to your own local mail administrator.
Finally, allow me to recommend to all mail administrators reading this
that
tonight's change will provide you with what I believe will be a more
than
compelling incentive to select some new and different source of open
relays
data. At the present time, there are at least four such services
available
to the general public.
Regards,
Ron Guilmette
rfg@localhost
P.S. I wish that I could recommend one of the four active open relays
listing
services above the others, but one of them refuses to accept automated
sub-
missions, two of the others don't seem to even answer their e-mail, and
the
final one has recently blacklisted my own non-open mail server, simply
be-
cause I made the small mistake of manually replying to one of their own
auto-replies that was sent in response to a prior message that I had
sent
them to nominate some open relays I knew about.
When and if a responsive and intelligently-run public open relays
listing
service become available, I'll certainly be among the first to use it
and to
recommend it.
--8<----------------------------------------------------------------------
Greetings from Vienna,
Alexander Talos
