I've recently bought a new router (actually not me but my family, and I consider their choice as bad). Now I have some lag spikes all the time when I use internet. It's mostly seen in games but also when I'm downloading something or travelling around the internet. Running ping test shows that its not only my imagination. I don't have any knowledge about that stuff and I don't know where should I look for reason of this situation.
Router I bought is Dlink Dir-300. Should I configure something for this router (right now all defaults). My internet provider says that its not their fault, but its a bad company which I will change when I will have opportunity. Can I check somehow is it my router or they cause this problems?