Addressing DNS issues in your router.
Addressing DNS issues in your router.
Not sure why this works, right? It’s about being exposed to a more reliable DNS server that avoids automatically sending bad links to an ad page. DNS is there for a reason, but the default one from your ISP often isn’t very strong or secure compared to services like 1.1.1.1 (Cloudflare) or 9.9.9.9 (Quad9). If you can change your router’s DNS provider to one of those, it should help. Using a weak ISP-managed DNS doesn’t improve safety.
If you're having DNS resolution issues across your network then yes you can change your DNS server. No this wouldn't leave you exposed so long as you know what you're connecting to. Really though the ISP provided DNS should be working just fine. If you can't connect to anything you may want to inspect your equipment. It's possible something's gone wrong, needs to reset or replaced. Depends on exactly what's giving you resolution errors. One computer or all your computers.
Uncertain about how you came across the idea of being "exposed." I haven't used Comcast's DNS services in a while. They were known for being slow, and Comcast has had some issues with DSN requests I've heard about. I've tried Open DNS and Google DNS. Open DNS is useful if you need filtering, though it isn't completely reliable. Right now, I use Google DNS because it's fast and works well.