said by kevinds:
Upstream no, because your router should simply drop the traffic, and not respond to it.
Downstream, possible, but unlikely with faster internet speeds. 10 mbps wouldn't be hard to saturate with ddos, 25 and up, significantly harder...
Upstream can be saturated by causing the router to respond to requests, via ICMP Ping or other services (eg. UPnP).
25Mbps is a ridiculously small DDoS attack. I suggest you do some reading --
The more I C, the less I see.