Cisco ASA Hardware Firewall

Can Cisco ASA firewalls restrict Internet access to branch offices?

I have a PPP network between our three office locations. In the master location I have a DSL line connected to my Layer 2 (L2) switch via a Cisco ASA 5505 Firewall. My server (ADC/DHCP/Proxy) is connected to the L2 switch. My branch office locations obtain IP through this server. I am using a Squid...

I am under a ddos attack and need to block country

I have Cisco ASA Hardware Firewall and O don't see how to block either a bunch of IP addresses (thousands) or deny access to a whole country. Is it possible? Adding one IP at a time is not an option. Thanks