Comcast DNS server keeps me from connecting to the internet elsewhere
I have a MacBook Pro running Catalina. At my office I have CenturyLink and I have Comcast at home. The last 2 days when I came into the office I could not connect to the internet on our wifi network. I talked to the CenturyLink tech and they told me to set my DNS to 205.176.3.65 which I did. Went home and did a few things on the internet but didn't touch my settings. Today when I came back in to the office, I couldn't connect and discovered the DNS was set back to 75.75.75.75 (for Comcast). So why does this happen on some days and not others? Is there a way to make it automatically set to the right DNS or am I going to have to keep doing this manually?
BTW, I remember the day when I first discovered this a few years back. I was on a road trip and frustrated that I could connect t to the internet in some locations but not others. I was sitting in a coffee shop trying to figure out why I couldn't connect when everyone else could. I just started playing with the advanced settings in network preferences, not really knowing what they did, and discovered that when I deleted the DNS server, which was also set to 75.75.75.75,, everything suddenly worked. And I thought, how come I had never heard of this? I am usually the most tech savvy guy in the office and somehow had never known about this trick. So far every time I haven't been able to connect, my DNS was set to Comcast's server and I wasn't on a Comcast network, so maybe this is unique to Comcast users?