On 2016-08-16 Kevin McGregor wrote:
search domA.example.org domB.example.org # [NOTE I made these up, but
My money is on NM also, like the others said. Invasive little !@%!@#%. You need to get it the heck out (uninstall) if you can, and/or make sure to put these in the ifcfg file for each interface:
NOZEROCONF=1 NM_CONTROLLED=no USE_NM=no PEERDNS=no
Sure sounds like PEERDNS is what is biting you. Are you using static PPPoE?
If that doesn't work, see what this tells you:
grep -iR domB.example.org /etc
It's gotta be coming from somewhere, and that somewhere is likely /etc. Could also search /var if you're pretty sure you won't get a zillion unrelated log files spilling their output.
If that still doesn't work, send us your ifcfg-* files for the relevant if's and tell us exactly what technology (first 2 OSI layers) it's using.