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RE: Gothcas of changing the IP Address of an Authoritative DNS Server

  • From: Gregory Hicks
  • Date: Wed Dec 14 14:23:32 2005


> From: "Ejay Hire" <ejay.hire@isdn.net>
> To: "'Eric Kagan'" <ekagan@axsne.com>, <nanog@merit.edu>
> Subject: RE: Gothcas of changing the IP Address of an Authoritative DNS Server
> Date: Wed, 14 Dec 2005 13:15:42 -0600
> 
> 
> assuming you've got the old box and the new one running
> concurrently, you could run tcpdump on the old box with a
> filter to only catch dns requests to the old ip.  Let it run
> for 24-48 hours and you could see who/what was still
> querying the old ip.

This topic comes up frequently on bind-users@isc.org ...

Might query there but many of these responses have covered much of what is 
discussed there.

Regards,
Gregory Hicks

> 
> -e
> 
> > -----Original Message-----
> > From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]
> On 
> > Behalf Of Eric Kagan
> > Sent: Tuesday, December 13, 2005 2:45 PM
> > To: nanog@merit.edu
> > Subject: Gothcas of changing the IP Address of an 
> > Authoritative DNS Server
> > 
> > We need to move our Primary DNS server from legacy IP
> space 
> > provided by our upstreams to our ARIN Assigned IP space.
> I 
> > am looking for advice and any gotchas.  I couldn't find
> any 
> > white papers to this affect or archived articles or
> postings. 
> >  If someone does have a resource for this or find this
> could 
> > be valuable, I can certainly gather all the info and
> document 
> > it.  Most of the Registrars I have seen now use the 
> > Authoritative DNS Server Host names for the domain name 
> > registrations vs the IP Address. For most of our
> customers, 
> > we register and host the DNS.  I have confirmed almost all
> 
> > the customers have either Network Solutions, Tucows, Go
> Daddy 
> > and Register.com.
> >  
> > Can I simply change the IP address of our DNS server and 
> > update the DNS Host Record with our registrar with the new
> IP 
> > and any A / NS records we have ?  As long as other
> customers 
> > domains have our DNS Server FQDN as the Host, they should
> not 
> > need to make any changes, correct ?   I would love to
> think 
> > its that simple, but there is always a gotcha.  Does
> anyone 
> > know of any main registries using just the IP Address
> where 
> > the customer might need to go in and make those changes
> for 
> > each and every domain ?  Any input, advice or ideas is
> appreciated.
> >  
> > Thanks
> > Eric
> >  
> > 
> 

-------------------------------------------------------------------
Gregory Hicks                        | Principal Systems Engineer
Cadence Design Systems               | Direct:   408.576.3609
555 River Oaks Pkwy M/S 6B1          | Fax:      408.894.3400
San Jose, CA 95134                   | Internet: ghicks@cadence.com

I am perfectly capable of learning from my mistakes.  I will surely
learn a great deal today.

"A democracy is a sheep and two wolves deciding on what to have for
lunch.  Freedom is a well armed sheep contesting the results of the
decision." - Benjamin Franklin

"The best we can hope for concerning the people at large is that they
be properly armed." --Alexander Hamilton






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