Thanks. How does tcpdump work? And setup? :) 2017-03-23 22:59 GMT+01:00 / UGC- Gaming.net / <[email protected]>:
> 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 >> > > > _______________________________________________ > 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
