A newbies Bind question

[Matthew Pounsett]

On 31-Jan-2009, at 13:24, Peter Privat wrote:

> My question:
> Is it possible for my friends out there somewhere in cybespace to  
> also use my DNS server by entering its IP their DNS settings?
>
> So far I haven't managed to make it work. If another computer  
> somewhere out there in the cloud is entering the IP of my private  
> DNS server into their internet settings, they are not able to use  
> that DNS server. It doesn't provide DNS at all. Seems like it is  
> blocked or doesn't allow computers that is not on the same subnet,  
> or something. Is there a configuration that I've missed? How do the  
> ISP's make their DNS servers usable for everyone?

By default, BIND blocks IP addresses that aren't on a local network  
from using it for recursion.  Setting up an open DNS server which  
permits anyone to use it creates an easy vector for your DNS server to  
be used in Denial of Service attacks, so the default is to be  
completely closed.    It is not recommended to open up your DNS server  
to the world.  If your friends have static IP addresses (i.e. the IP  
addresses of their computers aren't ever changed by their ISP) then  
you can allow them in using the 'allow-query' and 'allow-recursion'  
options.

There's HTML documentation for the 'options' grammar at <https://www.isc.org/software/bind/documentation/arm95#id2576918 
 >


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