If this is the answer, I am boggled by it. With Optonline supplied router, a user using a win 10 home HP laptop connected wirelessly (it doesn't have a wired NIC) to either 2.4 wifi or 5 (I forget which they were on).... they could consistently not resolve SOME addresses - like www.bloomingdales.com. And loads of others.
But other addresses resolved fine.
I checked for malware - none found, checked time and date - set correctly
I USED DIFFERENT DNS servers - optonlines, Google's, Open DNS... same results with the same websites (bloomie's and others failed regardless of DNS server, others resolve OK regardless of DNS server.
Pinging loads of public IP addresses - no dropped packets over 10s of minutes...
Turned off windows firewall - no change in the situation.
I did nslookup, set d2=1 and saw the domains resolve / fail.
Wanted to try that pc on a different network or add anotehr computer to the network. Finally, husband got home from a trip. Said 'yeah, I was having problems and changed the wifi network I was connecting to (2.4 to 5 or 5 to 2.4... I forget). The wife was on the same problem SSID (optonline router) as the husband initially. He changed her to the other SSID and problem solved.
REALLY!? Are there settings for the 2 bands that might influence DNS resolution for SOME addresses? That's what boggles my mind - yeah, maybe can't resolve any. OK. A network outage to the DNS servers (I tried several different ones). But can't resolve SOME? Because you are on 2.4 not 5 (or vice versa).??????
Have you ever heard of that? Would that be near the top of your list of things to suspect?
THANKS!
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