[AFMUG] DDOS Attack

[Matt]

Had another DDOS the other night.  We are using a Mikrotik Cloud
Router as our BGP gateway.  We have a couple BGP upstreams but our
main one currently is HE.net.  I have to admit there technical support
is exceptional.  They said they could drop the IP but in the end we
just rode it out for a few hours dropping at our Mikrotik gateway.  Is
there a way with BGP to tell our upstream to drop a certain source or
destination IP?