Registrars with free DynDNS services of my own domains.

[eculp]

Quoting Chuck Swiger <cswiger at mac.com>:

> Hi--
>
> On Feb 24, 2010, at 12:17 AM, Marcin M. Jessa wrote:
>> I actually figured out I can run my own services for all my domains
>> on a dynamic IP without breaking any DNS related RFC.
>
> Running an authoritative nameserver off of a dynamic IP is a  
> terrible idea.  Even if your dynamic IP doesn't change that often,  
> and you adjust your TTLs and expire times in the SOA  
> accordingly....whenever the IP does move, you are blindly hoping  
> that the former IP will not be given to a malicious or compromised  
> machine.
>
> Remember that random nameservers will be caching your nameserver  
> records for up to expiry, and will continue to send queries to the  
> old IP.  It's a trivial matter for it to continue to answer  
> authoritatively, and redirect mail, webserver requests, etc to  
> anywhere at all-- a localhost proxy scanning for login attempts,  
> bank info, etc would make a wonderful man-in-the-middle attack.
>
> You might think that with two nameservers listed, that the odds are  
> fifty-fifty whether queries go to your primary at a static IP or the  
> old secondary, but I've seen spamming domains which return DNS  
> queries stuffed with as many NS and A records as will fit in a UDP  
> packet (about 20) pointing to IPs all over the place in order to  
> make them harder to take down.  It also means that caching  
> nameservers and clients are less likely to send a request to a  
> legitimate nameserver for the domain (assuming one exists),  
> depending on how smart the clients are.

I basically agree, Chuck.  Of course there are places, such as the  
country where I live where ONE STATIC IP that is listed as dynamic and  
obviously causes some email issues, costs one thousand dollars a year.  
  Other solutions are with E-1's and base price is much, much higher.   
There are no dsl's with static IP's.

I could justify it here and many folks use them even though they are  
not optimal.

ed
>
> Regards,
> --
> -Chuck
>
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