[NTLUG:Discuss] Dynamic IP and External DNS - is it possible?
David Stanaway
david at stanaway.net
Thu Oct 25 18:54:51 CDT 2007
It would be cheaper for you to set up a virtual system at one of the
places mentioned in the recent hosting threads. That should have a
static IP and allow you to install whatever flavor of DNS server (Bind9
for instance - there are others).
YOu can then have your home pc register dynamically with that through
bind dynamic dns or through some other mechanism and have your virtual
server either be a secondary MX for your domain for when your primary
goes down.
The prob with using dynamic IP for your mailserver is that:
- dynamic ranges can tend to be blocked in rbls
- you don't control the PTR records for your IP and this is not
'correct' for an MX record which should be a canonical name with
consistent PTR record.
- If your IP changes and someone else gets your IP, then they will get
(And hopefully bounce) your email. Makes your domain look unreliable
(Because it is).
Keller Giacomarro wrote:
> Chris Cox wrote:
>> Keller Giacomarro wrote:
>>
>>> This is something of a Linux question, since I'm implementing it in Linux -
>>> please let me know if this type of query is inappropriate for this list.
>>>
>>> Being the student of networking that I am, I've recently gotten very
>>> interested in DNS. To learn more, I'd like to set up an external DNS server
>>> for my personal domain. Here's what's setup now:
>>>
>>> kellerg.com points to my RoadRunner cable IP address. I'm using
>>> no-ip.comto accomplish this.
>>> Everytime my IP changes, no-ip updates its DNS A record for kellerg.com with
>>> my current IP.
>>>
>>> What I want to have happen is DNS requests for my domain should come to my
>>> bind9 DNS server. I know that I can just add CNAME and MX records with
>>> No-IP, but I really just want no-ip to resolve kellerg.com and then pass
>>> everything else to my nameserver.
>>>
>>> No-IP says this isn't possible without a static IP. Is that true?
>>>
>> You have to register your nameservers (IPs) as being authoritative for
>> your domain (zone) so that when people want to query your records, they can.
>> So... yes... you need a static IP for your nameservers (and you really
>> should have more than one).
>>
>> With that said.... friends and family CAN use you as THEIR nameserver.
>> Thus in the their resolv.conf they would have:
>>
>> nameserver <your-ip-address>
>>
>> Of course, you can then be authoritative for ALL domains... AND you'll
>> need to handle recursive queries (if people find out about your little
>> nameserver they may ALL try to use it). They could also run their
>> own DNS servers which are mostly caching and delegate records out to
>> your nameserver for your domain (zone)... or even forward to it.
>> But obviously not as ideal as having a TRUE domain nameserver
>> with a registered static IP(s) associated with your domain (zone).
>>
>>
>> _______________________________________________
>> http://www.ntlug.org/mailman/listinfo/discuss
>>
> Chris,
>
> Thank you for not only the answer to my question, but some cool ideas
> for things I can do with DNS until I can afford to pay the extra per
> month for static IPs!
>
> On that note, is anyone aware of quick (6Mbps down, 256k up or faster)
> DSL or cable service that provides static IPs and is reasonably priced?
> Thanks again. =)
>
> -Keller
>
> _______________________________________________
> http://www.ntlug.org/mailman/listinfo/discuss
>
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