My friend has a server that hosts 2 websites and a game server, which is getting ddosed. What we did so far was try and switch to a virtual private network, but that didn't help. We changed the IP address and yet the guy still found it again.
What are some ways to protect his servers from this? I'm not too advanced with network security so try and keep it relatively simple if you can.
Thanks
There are some really good SOHO routers out there that have DDoS protections. Additionally you can buy an IPS or create a NAT for the servers.
SOHO = small office home office
IPS = Intrusion Protection
NAT = Network Address Translation
DDoS the people who are DDoSing your friend.
DDoS attacks are usually never from one single person. If it was, it wouldn't be effective. So one PC trying to DDoS multiple PCs would be laughable.
They could find your new IP address because, since you're running a web and gaming server, your DNS will point to whatever IP address you have.
Changing it will not do much. i would suggest doing the steps HelloMrOwl listed above.
You and/or your friend aren't going to be able to do much without knowledge. So get to learning, and check out Snort imo.
https://en.wikipedia.org/wiki/Snort_%28software%29
An ips system wont help as there is still too much data, If it is important get some mitigation service you can hire. Rent an amazon server for a while to mitigate the ddos, you could have it run some Apache reverse proxying?
As for the game server well that's prolly just fucked