On 2014-04-30, Les Mikesell lesmikesell@gmail.com wrote:
On Wed, Apr 30, 2014 at 10:01 AM, Keith Keller kkeller@wombat.san-francisco.ca.us wrote:
No settings might be better. If I take my laptop from one site to another, keeping my previous resolv.conf intact, and NM doesn't remove it, then my laptop will try to query the previous site's DNS. They may not like that; depending on how paranoid they are, they may even take measures to block my traffic. Even if not, I may see some really bizarre DNS behavior which could be difficult to troubleshoot, whereas having no DNS at all will be very obvious very quickly.
So you only have one network interface active at a time?
That is of course not what I wrote. The above is just one example where I might prefer an empty resolv.conf instead of an old (and possibly incorrect) one.
Our servers typically have at least 6 NICs and it is pretty common to have at least 4 active on different subnets. And bringing up a new interface does _not_ mean I always want to use the DNS servers or default route DHCP might offer.
So in this case you might prefer an old resolv.conf instead of a new one or an empty one I don't recall anyone ever writing that any of these scenarios is always preferable over the other.
At any rate, for CentOS 6 we can still say "if you don't like NM, don't use it".
--keith