[CentOS] Can one construct an IPTables rule to block on NS records?

[Kahlil Hodgson]

On 6 October 2015 at 00:46, James B. Byrne <byrnejb at harte-lyne.ca> wrote:

> So, is there any convenient way to construct an IPTables rule to block
> all IPs associated with a given Domain Name server?
>

​You can use ipsets to block a large collection of IP addresses with
netfilter.  I block various problematic countries that way.

The problem is getting _all_ the IP addresses associated with a DNS
server.  I don't think that is going to be easy/possible, unless that DNS
sever has been badly misconfigured.



​K​