tcpdump needed :) On Thu, Mar 23, 2017 at 11:54 PM, Mathias <[email protected]> wrote:
> How Marco? CSGO Cvar? Iptables? > > 2017-03-23 22:53 GMT+01:00 Mathias <[email protected]>: > >> Thanks for this awesome help John! This kind of "Attack" have been >> attacking me for days without stopping. >> >> So i block the port everytime they attack on new port? And what if they >> attack on the port directly? There must be a kind of filter possible on >> Linux with Iptables. Anything i can tell me datacenter to fix this attack >> permanent? >> >> >> >> 2017-03-23 22:44 GMT+01:00 John <[email protected]>: >> >>> If you're seeing packets from port 28960, you're most likely seeing a >>> reflected query DDoS that is coming from CoDx servers (you can tell for >>> certain by looking at the contents of captured packets -- look for the >>> string 'statusResponse') -- not a direct query/connection flood, and likely >>> not spoofed. You can safely block traffic from port 28960, or do a more >>> thorough filter to block that traffic. This is an example rule to just >>> block the port. >>> >>> iptables -I INPUT -p udp --sport 28960 -j DROP >>> >>> -John >>> >>> >>> On 3/23/2017 2:33 PM, Mathias wrote: >>> >>> Thanks John. >>> >>> Could you guide/send me the Iptables? >>> >>> My server is on port 27115 and the attack comes in on port 28960 - But >>> it wont work block the port (Have tried) >>> >>> "IP rate limit sustained 79085 distributed packets at 2636.2 pps (1246 >>> buckets). >>> >>> IP rate limit under distributed packet load (1205 buckets, 15001 global >>> count), rejecting 8.59.18.221:28960. >>> >>> IP rate limit sustained 78411 distributed packets at 2613.7 pps (943 >>> buckets). >>> >>> IP rate limit under distributed packet load (1210 buckets, 15001 global >>> count), rejecting 154.112.126.3:28960. >>> >>> IP rate limit sustained 104375 distributed packets at 3479.2 pps (968 >>> buckets). >>> >>> IP rate limit under distributed packet load (1152 buckets, 15001 global >>> count), rejecting 84.3.222.161:28960. >>> >>> IP rate limit sustained 78941 distributed packets at 2631.4 pps (795 >>> buckets). >>> >>> IP rate limit under distributed packet load (1176 buckets, 16663 global >>> count), rejecting 88.131.51.148:28960." >>> >>> >>> 2017-03-23 22:27 GMT+01:00 John <[email protected]>: >>> >>>> On 3/23/2017 1:34 PM, Mathias wrote: >>>> >>>>> My server's getting flood with VSE DDoS Attack. My server have DDoS >>>>> Protection but it wont take it. any other DDoS Attack does it takes so >>>>> what >>>>> can i do? i'm on Linux Ubuntu 16.04. >>>>> >>>>> Here is server logs - http://pastebin.com/Q2dbcEMt >>>>> >>>>> I also got how the script works (VSE DDoS Attack) - Found on a forum >>>>> via Google >>>>> >>>>> Any idea to stop it with Iptables? Packet limit? >>>>> >>>> >>>> The term "VSE" ("Valve Source Exploit") that the attackers like to use >>>> is a misnomer because there isn't an exploit involved. These attacks just >>>> flood a server with spoofed queries and/or connection attempts from random >>>> sources, and Source can't handle the volume. >>>> >>>> Currently the most effective general-purpose way to deal with these is >>>> to whitelist real player IPs and rate-limit queries and connection attempts >>>> from all other sources (down to around 1000/s). This can be done with >>>> iptables using a combination of the ipset, hashlimit, and bpf/u32/string >>>> modules. >>>> >>>> Ideally, the game would be redesigned to using TCP for queries and the >>>> very first part of the connection, offloading the first-contact tasks to >>>> the OS, which has established methods for combating high-rate spoofed TCP >>>> SYN floods. Internally, it could then straight drop all UDP packets that >>>> don't correspond to a currently connected player. >>>> >>>> -John >>>> >>>> _______________________________________________ >>>> Csgo_servers mailing list >>>> [email protected] >>>> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/csgo_servers >>> >>> >>> >>> >>> _______________________________________________ >>> Csgo_servers mailing >>> [email protected]https://list.valvesoftware.com/cgi-bin/mailman/listinfo/csgo_servers >>> >>> >>> >>> _______________________________________________ >>> Csgo_servers mailing list >>> [email protected] >>> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/csgo_servers >>> >> >> > > _______________________________________________ > Csgo_servers mailing list > [email protected] > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/csgo_servers >
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