I don't like to use their kennel for punishment since they need to be put there at times when it has nothing to do with punishment and it could get very confusing to them. Especially if you are kennel training them for housebreaking -- that could be a real problem, if they start equating the kennel with punishment.
I do like redirection -- getting them something that is appropriate to chew and bite on. If they continue, I stop playing with them for a period of time. It does not have to be long -- 10 minutes is enough to get your point across to them. After that, they will have forgotten why you aren't playing with them. Some pups may do this no matter what, but many times it is the result of leaving their mom & siblings too soon as that is where they usually learn bite inhibition. If you think they did not learn well enough from their momma, you can act as a surrogate. I had to raise a litter of pups who lost their momma so I had to do this. I would gently pinch a little skin at the nape of their neck. Do NOT hurt them, (it is an attention getter not a physical punishment) and say sharply "No Bite." Do it EVERY time, consistency is a big thing with puppy training of any kind. Stop playing with them after that for a few minutes. They will get the idea that biting you, brings on a harsh word and no more playing. They will want interaction with you, so they will learn not to bite. Some chewing is okay and part of their normal play -- as long as they are not breaking the skin or hurting you, I would not mind it. That is just something puppies do.
But they do need to learn the boundaries and not to bear down too hard.