Cloudflare reverse DNS SERVFAIL, normal?
marka at isc.org
Wed Aug 31 00:12:13 UTC 2016
In message <46671DC5-3138-4E7A-A5AF-631B98FE354A at delong.com>, Owen DeLong writes:
> > On Aug 30, 2016, at 15:02 , Mark Andrews <marka at isc.org> wrote:
> > In message <926F8B85-8864-4424-BEAA-1836B718A9FD at delong.com
> <mailto:926F8B85-8864-4424-BEAA-1836B718A9FD at delong.com>>, Owen DeLong
> >>> On Aug 29, 2016, at 17:01 , Mark Andrews <marka at isc.org> wrote:
> >>> In message <20160829234737.GA16137 at cmadams.net>, Chris Adams writes:
> >>>> Once upon a time, Mark Andrews <marka at isc.org> said:
> >>>>> The following is general and is not directed at Cloudflare. I know
> >>>>> some people don't think errors in the reverse DNS are not critical
> >>>>> but if you are delegated a zone it is your responsablity to ensure
> >>>>> your servers are correctly serving that zone regardless of where
> >>>>> it is in the DNS heirarchy. Failure to do that causes additional
> >>>>> work for recursive servers. If you don't want to serve a zone then
> >>>>> remove the delegation.
> >>>> You are assuming that an authoritative server operator has some way
> >>>> know all the zones people delegate to their servers, and remove such
> >>>> delegations if they don't want to handle them. That is a wrong
> >>>> assumption.
> >>> They have methods. They choose not to use them. See RFC 1033
> >>> COMPLAINTS then after that the court system.
> >>> Mark
> >> Let us review this and compare to your statementâ¦
> >> From RFC 1033:
> >>> COMPLAINTS
> >>> These are the suggested steps you should take if you are having
> >>> problems that you believe are caused by someone else's name server:
> >>> 1. Complain privately to the responsible person for the domain.
> >>> can find their mailing address in the SOA record for the domain.
> >>> 2. Complain publicly to the responsible person for the domain.
> >>> 3. Ask the NIC for the administrative person responsible for the
> >>> domain. Complain. You can also find domain contacts on the NIC in
> >>> the file NETINFO:DOMAIN-CONTACTS.TXT
> >>> 4. Complain to the parent domain authorities.
> >>> 5. Ask the parent authorities to excommunicate the domain.
> >> 1. Doesnât really apply in a situation where someone has pointed
> >> an NS record for a domain at your server without warning. There
> >> is no SOA record from which to retrieve said mailing address.
> > If they have pointed a NS record at you there is a SOA record. Either
> > in the zone or in the delegating zone.
> Sure, but most likely this isnât particularly usefulâ¦ See below.
> >> Also doesnât work very well in cases where the SOA record does
> >> not contain a valid email address that reaches someone.
> > Some do, some don't. There is also whois address, web contact addresses
> > etc.
> Sometimes, if youâre lucky, if it all works as intended and the person
> isnât using domain privacyâ¦
Domain privacy is supposed to pass on operational and legal issues.
It isn't a get out of free card for not running a nameserver / zone
> >> 2. Do we really want NANOG buried in âWill the
> >> @#@[email protected][email protected]$% who delegated XYZ.COM <http://xyz.com/>
> <http://xyz.com/ <http://xyz.com/>> NS Records to
> >> point to
> >> my servers <name> and <name> please cease and desist?â
> >> messages? Personally, I vote no.
> > Why not. It is a operational message about a misconfiguration.
> Because NANOG isnât for solving individual misconfigurations. Itâs for
> discussing issues on the internet requiring coordination.
> This doesnât require coordination of multiple providers, itâs a simple
> bug report.
> It would significantly raise the N in SNR IMHO. Your opinion may differ.
> I still vote no.
> >> 3. The NIC? Please explicate Mr. Andrews what that would mean
> >> in the modern era. Please cover both the normal case and
> >> the cases where domain privacy is configured.
> >> 4. This might _MIGHT_ actually work, but I suspect that $REGISTRY
> >> is unlikely to help much when $REGISTRAR accepted an NS record
> >> from one of their customers for a domain they registered
> >> that happens to point to your server. Similarly, I suspect
> >> $REGISTRAR is going to tell you that they wonât make changes
> >> without authorization from the domain owner.
> > The registrar becomes party to the disruption to your services and
> > no the contract the registry signed with ICANN does not save them
> > from being fined by a court further down the process so they should
> > listen as it is their finanical interests to listen.
> What disruption? Itâs pretty hard to argue that sending back some
> SERVFAIL responses as a result of a few errant packets on UDP/53
> constitutes a significant disruption to service.
Owen you have zero knowledge of the volume or impact a configuration
error causes. Some are minor, some are not.
> > Criminal law trumps contract law and deliberate disruption to
> > services falls under criminal law. It becomes deliberate once they
> > fail to act on the complaint in a timely manner. Remember we are
> > dealing with matters of fact here. Published NS records and address
> > records.
> Sure, but to get a DA to prosecute for deliberate disruption, one has
> to be able to prove intent. Mere misconfiguration is not intent.
> Mere misconfiguration followed by ignoring bug reports becomes a little
> more grey, but I bet youâre still not likely to get very far without
> a much larger disruption to your service in the form of time spent
> than you suffer by simply ignoring it.
I suspect ignoring a certified letter complaining about the problem
with easily verifiable facts leads to easily provable intent.
> > Add to that there are published proceedures that are not being
> > followed that they should be aware of.
> Published procedures donât have the force of law. They may help you
> to create a presumption of misconduct or negligence, but thatâs about
> as far as they can go.
I agree they don't have the force of law but courts do pay attention
to them especially when one of the parties involved has tried to
follow them to avoid going to the courts in the first place.
> >> 5. I suspect that success in this effort will likely parallel
> >> the level of success I would expect in step 4.
> >> So, now that weâve realized that RFC-1033 is utterly useless in this
> >> context and badly outdated to boot, letâs review your other suggestionâ¦
> > No, it isn't utterly useless. It also shows you have tried to solve
> > the problem in a civil manner if you take it further.
> It has a less than 0.001% probability of achieving a useful end result.
A made up statistic. I've had better success with errors at stage
1 than that, probably about 20% and no I don't have the records to
> I consider that within the realm of âutterly uselessâ. YMMV.
> >> ââ¦ after that [sic] the court system.â
> >> [sic] refers to the missing comma.
> >> So let me see if I understand correctly.
> >> I run a pair of nameservers. Letâs call them ns1.company.com
> >> <http://ns1.company.com/> and ns2.company.com <http://ns2.company.com/>
> >> Someone registers example.com <http://example.com/> and points NS
> >> in the COM zone at my
> >> nameservers.
> >> Iâm now supposed to seek judicial relief in order to compel them to
> >> doing that?
> >> Small claims doesnât process claims seeking injunctive relief. I
> >> I could
> >> use a $1,500 or even $5,000 small claims case as a way to get their
> >> attention,
> >> but thatâs kind of an abuse of the process. If I want an injunction, at
> >> least
> >> in California, I have to go to Superior court.
> >> Now, first, we have to figure out jursidiction. As a general rule,
> >> jurisdiction
> >> goes to the court which is responsible for the locale in which the
> >> takes
> >> place or where the contract was entered into, or the jursidiction set
> >> the
> >> contract. In this case, thereâs no contract, so we have to look at
> >> the
> >> event in question occurred. The problem is that the law hasnât really
> >> caught
> >> up with technology in this area and depending on who ends up being
> >> to the suit, the definition gets pretty murky at best. Is it the
> >> office of the registry? The registrar? The registrant? The location of
> >> nameserver(s) which are erroneously pointed to? (What if they are
> >> all over the world?) The business address of the operator or owner of
> >> those
> >> nameservers? Where, exactly do we file this suit?
> > Your lawyer will work that out.
> OK, so let me make sure Iâm understanding you correctly.
> Iâm getting these extra packets I donât want. Theyâre probably costing me
> less than $1/day, but theyâre a bit annoying.
> You now want me to go pay someone $300/hour to sort all of this out,
> against a $5,000 or $10,000 retainer just to start?
> Will you be financing any of these operations, or, are you just hoping
> weâre all dumb enough to bankrupt ourselves in the name of clean DNS?
> >> The next problem we have is who to sue. Do we sue the domain
> >> The
> >> registrar they used to register the domain name? etc.
> > Your lawyer will work that out.
> See above.
> >> Yeah, I donât think thereâs enough possibility of any sort of recovery
> >> make that worth the effort or expense.
> > So you decide to not avail yourself of the process available to you.
> > is not the same thing as saying there is no process.
> I never said there was no process. I said that the existing process was
> If the procedural argument doesnât convince you and the economic argument
> sink in, then, you are entitled to your opinion, but Iâm willing to bet
> that a
> much larger fraction of the community believes that there is nothing to
> be gained
> from the process compared to the costs of engaging in it.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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