How can I prevent DDos on my server?

[TheSniperCatt0]

Hello! I am running a gmod server but its down half the time sadly. Why so? It gets DDosed to death. I have to run it off my own pc incase you need to know. How can I prevent DDos or figure out who is doing it?

[ZipTake8.5]

Use VPN if you want to stop preventing from it?

[TheSniperCatt0]

Originally posted by 𝙸𝚃𝙺𝙴𝚈𝚂𝙾𝙽:

Use VPN if you want to stop preventing from it?

are there any good free ones?

[[N]ebsun]

If you run the server, then you should be able to see all inbound (and outbound) traffic.
You will have to set up firewall rules to block the attack, while still allowing legit traffic to reach the server.

I find that the usual attacks come from amazon / microsoft / roblox / or other various datacenter / hosting providers - either through the attacker paying to use those services to ddos, or via malware or other vulnerabilities in whatever legit server software is running there.

Usually from countries that are very far away - so a geoip based restriction can work to a good extent.

Since it's Windows, I don't know of an easier way to see and filter the traffic other than something like wireshark - filter based on inbound traffic with the destination port that your server is running on

I am not 100% sure if gmod uses the A2S protocol (but I think it does), so adding the challenge auth will help prevent dos reflection
In your startup script, or in environment variables, set these:

set STEAM_GAMESERVER_A2S_INFO_REQUIRE_CHALLENGE=1
set STEAM_GAMESERVER_PACKET_HANDLER_NO_IPC

see the thread for more details
https://steamcommunity.com/discussions/forum/14/2974028351344359625

[ZipTake8.5]

I don’t think wireshark isn’t good

[🅰𝐗★DΣVIL]

yes

[ZipTake8.5]

Originally posted by ☬ 🅷🅴🆁🅾🅸🅽 ☬:

yes

Tell me what’s wireshark do?

[ZipTake8.5]

Originally posted by CrazySniperCatt0:

Originally posted by 𝙸𝚃𝙺𝙴𝚈𝚂𝙾𝙽:

Use VPN if you want to stop preventing from it?

are there any good free ones?

They are not free ones you must paid them