[ibr-dtn] Dht ibrdtn package

Hello,

I'm struggling with a weird fact, I can not ping from one dtn node(C) to another dtn node (A), and I cannot understand completely why. I have set the right clocks and the configuration but first I have to ping (dtnping) from A to C in order that C can ping A, if I start directly pinging from C to A the nodes cannot see each other. Indeed, looking at the log of C there aren't other dtn nodes present... The discovery_announce are set on C but I don't know how to check whether it's enabled on A (this node uses openwrt). Any hint of what's going on?

Furthermore, I would like to know the functionality of DHT package, what is it used for?

Thanks in advance,

Ragards!