i dont know what is the problem but im sure ive got the switch properly configured for dhcp snooping. trusted port only on the ones facing the dhcp server but the discover message is dropped by the MAIN SWITCH. attached is the packet tracer file. ITS...

I am trying to ping an end device from another network through Internet(ISP layer3 switch) using NAT overload on both routers. is it possible or it really is normal to not be able to ping because of single public IP? I am able to ping loopback addres...