Mickael Maddison centos@silverservers.com wrote:
Hello Les, Forgive me for this sidestep, but you are saying that Windows/IE actually ignores bad IP addresses if a site
lists
multiple IP's in a DNS lookup? I tried this approach for some redundancy a couple years ago and it didn't seem to
work
as you suggest. If it has indeed changed to work that way, this will help one of my clients immensely.
No. The Windows resolver does not work so well. It's quite the opposite. The resolver and IP stack actually "holds down" names and IPs depending on availability -- for the _entire_ name. It also varies based whether it is DNS or ADS-integrated DNS.
There's about 2 dozen factors that I really don't want to get into on a Linux -- most specifically RHEL/CentOS -- list. You can really hack around the registry and change the attributes of the Windows resolver/stack, but at _no_ point have I _ever_ seen the resolver, stack or apps like MS IE ignore some IPs and use others, from DNS.
The only time I've seen MS IE do some interesting resolution is for ADS -- using RPC services, _not_ DNS (even if it is seemingly hitting a DNS server, it's ADS-integrated DNS and works very differently, long story).