What can I do about ants under enclosed front porch?

Boiling water, or ant powder, some ants pick it up and take it back to the best and kills them off

A mixture of icing sugar and baking soda in a jar lid will get rid of ants. They take it back to their home and share it. They blow up and die.

Terro ant killer. We put it wherever we see ants traveling. They manage to share it with the rest of their buddies.

Equal parts sugar and borax in a jar with warm water. Put over cotton balls and within 6 hours (2 for inside), all your ants will be gone. They take the mixture and share with the other ants and die. We used this method in a restaurant and it worked like a charm. Good luck!

thank you. I will definitely use this. Rotaorleans

Spray everywhere around the porch. Also ant powder would be good too.

Sprinkle DE where you see them most. If you find and destroy the nest. But unlike most sprays DE isn't harmful to people or pets.

Borax and sugar: https://www.hometalk.com/diy/outdoor/pest-repeller/quick-dyi-sweet-bait-to-treat-and-get-rid-of-your-ants-18515410