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<body class='hmmessage'><div dir='ltr'>Sorry. My description isn't very clear.<BR> <BR>The local dns server isn't a stealth slave. I need a stealth slave and the local dns server can query it when all public NSs are out of service.<BR> <BR>Thanks!<BR>Guanghua <br> <BR><div><br>> Date: Mon, 24 Feb 2014 13:41:03 -0500<br>> From: Kevin Darcy <kcd@chrysler.com><br>> To: bind-users@lists.isc.org<br>> Subject: Re: how to hidden the salve<br>> Message-ID: <530B923F.8070409@chrysler.com><br>> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"<br>> <br>> I guess I'm still not understanding your requirements. In my thinking, <br>> the local DNS server would *be* a stealth slave. Why are you considering <br>> these as 2 separate instances?<br>> <br>> - Kevin<br>> <br>> On 2/24/2014 9:56 AM, houguanghua wrote:<br>> > Dan,<br>> ><br>> > Yes, also-notify can hide the slave name server. But local dns server <br>> > can't know where is 'stealth' slave too.<br>> ><br>> > Thanks,<br>> > Guanghua<br>> ><br>> > ------------------------------------<br>> > Date: Fri, 21 Feb 2014 07:50:05 -0600<br>> > From: Daniel McDonald <dan.mcdonald@austinenergy.com><br>> > To: Untitled <bind-users@lists.isc.org><br>> > Subject: Re: bind-users Digest, Vol 1769, Issue 1<br>> > Message-ID: <CF2CB5AD.6AE8E%dan.mcdonald@austinenergy.com><br>> > Content-Type: text/plain; charset="US-ASCII"<br>> ><br>> > On 2/21/14 3:39 AM, "houguanghua" <houguanghua@hotmail.com> wrote:<br>> ><br>> > > kevin,<br>> > ><br>> > > How does the local name server learn where is the 'stealth' slave? <br>> > For the<br>> > > 'stealth' slave isn't in the NS records.<br>> ><br>> > Also-notify directive. Either in an options stanza or a zone stanza.<br>> ><br>> > ><br>> > > thanks,<br>> > > Guanghua<br>> ><br>> > -- <br>> > Daniel J McDonald, CISSP # 78281<br>> ><br>> ><br>> ><br>> > > Date: Thu, 20 Feb 2014 10:48:36 -0500<br>> > > From: Kevin Darcy <kcd@chrysler.com><br>> > > To: bind-users@lists.isc.org<br>> > > Subject: Re: how to hidden the salve<br>> > > Message-ID: <530623D4.3000508@chrysler.com><br>> > > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"<br>> > ><br>> > > A "stealth" slave has a full copy of the zone, is not published in the<br>> > > NS records, and can resolve names in the latest copy of the zone <br>> > that it<br>> > > transferred, even if all of the published NSes are down due to a DDoS<br>> > > attack.<br>> > ><br>> > > So, does that not meet the requirements?<br>> > ><br>> > > - Kevin<br>> > ><br>> > > On 2/20/2014 1:28 AM, houguanghua wrote:<br>> > > > "Stealth" slave doesn't fully meet the requirement. It's just part of<br>> > > > the requirement to not publish the slave name server in the NS<br>> > > > records. Further more, the 'stealth' slave is quired by local DNS<br>> > > > server only when all name servers in the NS records are out of <br>> > service<br>> > > > ( maybe in case of ddos attack).<br>> > > > Guanghua<br>> > > > ------------------------------<br>> > > > On 2/19/2014 11:54 AM, Kevin wrote:<br>> > > > Date: Wed, 19 Feb 2014 11:54:44 -0500<br>> > > > From: Kevin Darcy <kcd@chrysler.com><br>> > > > To: bind-users@lists.isc.org<br>> > > > Subject: Re: how to modify the cache<br>> > > > Message-ID: 5304E1D4.5000303@chrysler.com<br>> > > > <mailto:5304E1D4.5000303@chrysler.com><br>> > > ><br>> > > > Not a good solution. Even under "normal" circumstances, there will be<br>> > > > temporary bottlenecks, dropped packets, etc.. that will trigger <br>> > failover<br>> > > > and users will get different answers at different times. Not good for<br>> > > > support, maintainability, user experience/satisfaction, etc.<br>> > > ><br>> > > > If all you want is resilience, and you own/control the domain in<br>> > > > question, why not just slave it ("stealth" slave, i.e. you don't <br>> > need to<br>> > > > publish it in the NS records)?<br>> > > ><br>> > > > If you *don't* own/control the domain in question, what business <br>> > do you<br>> > > > have standing up a "fake" version of it in your own <br>> > infrastructure? Not<br>> > > > a best practice.<br>> > > ><br>> > > > - Kevin<br>> > > ><br>> > > > On 2/19/2014 4:51 AM, houguanghua wrote:<br>> > > > > Steven,<br>> > > > ><br>> > > > > Your solution is very good. It can forward the queries to<br>> > > > > the specified name servers first.<br>> > > > ><br>> > > > > But if the specified name server is enabled only when normal dns <br>> > query<br>> > > > > process is down. How to configure the local DNS server? The detailed<br>> > > > > scenario is descibed in below figure:<br>> > > > ><br>> > > > ><br>> > > ><br>> > > > --------------<br>> > > > | Root |<br>> > > > | nameServer |<br>> > > > / -------------<br>> > > > (2)/<br>> > > > /<br>> > > > ---------- ----------- -------------<br>> > > > | Client | __(1)____\ | Local | ___(3)_____\ |<br>> > > > Authority |<br>> > > > | Resolver | / | DNS Server | X / | DNS<br>> > > > Server |<br>> > > > ---------- ------------ -------------<br>> > > > \<br>> > > > \(4)<br>> > > > \<br>> > > > \ ------------<br>> > > > | Hidden |<br>> > > > | DNS Server |<br>> > > > ------------<br>> > > ><br>> > > > > Normally,<br>> > > > > 1) A internet user wants to access www.abc.com <http://www.abc.com<br>> > > > <http://www.abc.com/>>,<br>> > > > > a DNS request is sent to local DNS server<br>> > > > > 2) Local DNS server queries the root name server, the .com name<br>> > > > > server to get the Authority Name Server of abc.com<br>> > > > > 3) local DNS server queries the Authority name server, and gets <br>> > the IP<br>> > > > ><br>> > > > > But when the Authority name server is down, the internet user won't<br>> > > > > get the IP address. My solution is as follows:<br>> > > > > a) A hidden name server with low performance is deployed. When<br>> > > > > authority name server can't be accessed, local dns server will <br>> > access<br>> > > > > the hidden server.<br>> > > > > b)The hidden server is never used in normal situation. It act as<br>> > > > > a cold backup for authority name server.<br>> > > > > c) The zone file in the hidden server is the same as that<br>> > > > > configuration in the authority name server<br>> > > > > d) The hidden name server doesn't appear in the NS records<br>> > > > > of authority name server<br>> > > > ><br>> > > > > Btw, all above doesn't consider the cache in the local dns server.<br>> > > > ><br>> > > > ><br>> > > > > Best Regards,<br>> > > > > Guanghua<br>> > > > ><br>> > > > ><br>> > > > > > Date: Mon, 17 Feb 2014 09:09:13 +0000<br>> > > > > > Subject: Re: how to modify the cache<br>> > > > > > From: sjcarr@gmail.com<br>> > > > > > To: houguanghua@hotmail.com<br>> > > > > > CC: bind-users@lists.isc.org<br>> > > > > ><br>> > > > > > On 17 February 2014 01:17, houguanghua <houguanghua@hotmail.com><br>> > > > wrote:<br>> > > > > > > I want to override the IP address of NS, for I want to use other<br>> > > > > authority<br>> > > > > > > DNS which isn't registered.<br>> > > > > ><br>> > > > > > For that you use forwarding. Create a zone statement for the <br>> > zone in<br>> > > > > > question and forward the queries to a different name server. <br>> > You don't<br>> > > > > > need to mess with the cache.<br>> > > > > ><br>> > > > > > https://mknowles.com.au/wordpress/2009/07/20/bind-forwarding-zone/<br>> > > > ><br><br></div> </div></body>
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