[CentOS] DNS forwarding vs recursion

Mon Apr 1 18:17:10 UTC 2013
John R Pierce <pierce at hogranch.com>

On 4/1/2013 6:11 AM, Michael H. Warfield wrote:
> it's also very important to implement BCP (Best Common Practice) 38.
> BCP 38 recommends router egress filtering.  That is, you only route out
> what will route back in.  That prevents you (or any of your customers)
> from being a spoofing source.

of course, this breaks a bunch of types of ad-hoc multihoming, where you 
have multiple ISPs, each with their own subnets, and you're trying to 
load balance your outbound traffic.

john r pierce                                      37N 122W
somewhere on the middle of the left coast