An Ddos attack or can be known as Dos attack (Distribution Denial of Service) can compromise or shutdown a PC or a network.
In the case of a network often its the router that is explioted. The system overloads by excessive bandwidth being stolen. A router which lots of people have no choice but use them, handles the traffic of the network.
In very simple terms the network is pinged at such a rate it can’t handle it and shuts down. Case in point remember the Yahoo crash this attack is the same thing.
There are various forms of attacks, such as, nuke, ICMP ect.. I will try and keep it simple.
So here are some possible solutions:
1. Change the IP address update the new IP on a internal DNS server.
2. Some filtering techniques may help such as look for a common thread in the attacks and deny access
3. Increase bandwidth of your server let the attacks keep coming find the common thread then deny access
This is a huge topic. With the limited info you provided theses are the possible solutions.
I would need to know the DB info, router info, ect…
But I hope this limited info may get you thinking. Greek39