Blocking ads on router indirectly?

The easiest way to do this with a DNS service. If you subscribe to Alteate DNS or Open DNS, they may be able to get most of that done for you with very little configuration. Just have your router hand out their DNS server IPs, and you may be good to go. I believe there are free service tiers at both.

Alteatively, while probably not possible on your router (due to hardware lacking the required horsepower), Pi-Hole is a project that does exactly what you're looking for as an actual service running on your network. Others have done it differently. It can probably be adapted with very little work for a more powerful router running an open OS like Tomato, DD-WRT, OpenWRT, HyperWRT, Gargoyle, or ViOS (Ubiquity devices are a great option). There are a lot of guides out there that could be adapted, and some purpose built stuff just for this. Check them out!

Pi-Hole: https://pi-hole.net/

Adafruit Guide: https://lea.adafruit.com/raspberry-pi-as-an-ad-blocking-access-point/overview?view=all

Do a little research, and you'll find a lot of material on this.

Here are two DB references for your hardware:
OpenWRT
DD-WRT

Outside of that, if you're wanting to try and implement it on a router, I'd ask around on the respective support forums for those OS mentioned above. I would bet dollars to donuts there are power users that have done this already, just on something with a little beef.

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