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The problem is that we are receiving for example 1 GBPS attacks to
one IP from serveral sources ( maybe 15 - 20 ips )<br>
<br>
That means that 1 GB of inbound is occupied. We have iptables rules,
of course, but is affecting all services on that dedicated server<br>
<br>
El 23/02/12 23:42, Boyd G. Gafford Ph.D. escribió:
<blockquote cite="mid:4F46C0C1.60803@westportresearch.com"
type="cite">
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Hey there, thanks for responding.<br>
<br>
I'm not sure I understand what you mean by "the line is occupied
anyway." If you mean the bandwidth to the server is saturated by
the flood, then yeah, its going to affect game play. Fortunately
most servers at data centers have high enough bandwidth to them
that a typical attack doesn't saturate.<br>
<br>
If your game server port is the target of a single IP UDP flood
attack, then typically an iptables drop rule handled by the kernel
is more efficient than the game server itself, especially if the
flooded packets are server commands that are being processed by
the game server, which is sending out UDP reply packets. That
takes up much more CPU than a kernel-level packet drop.<br>
<br>
Under those circumstances, the cheap VPS we use in Dallas has
endured 64Mbps attacks for hours and the game server is still very
playable. It would be nice if the flood was blocked at the router
or carrier level, but still iptables is pretty amazing when the
kernel drop is your last line of defense.<br>
<br>
Thanks,<br>
<br>
<i>Boyd</i><br>
<br>
<br>
On 02/23/2012 04:22 PM, NewLight Systems wrote:
<blockquote cite="mid:4F46BC41.4010505@newlightsystems.com"
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It's ok but this isn't working if the UDP floods to your server
because the line is occupied anyway.<br>
<br>
If you are the target, there's nothing you can do in a dedicated
server level.<br>
<br>
This type of attack ( allways if you are the target ) have to be
erradicated in a higher level ( router or carrier ) if you want
to preserve your connection<br>
<br>
El 23/02/12 23:12, Boyd G. Gafford Ph.D. escribió:
<blockquote cite="mid:4F46B9E7.2030501@westportresearch.com"
type="cite">
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Hey everyone, EscapedTurkey told me about this group, and so I
Just wanted to say a quick hello.<br>
<br>
I'm the guy who got frustrated enough with UDP flood attacks
that I wrote ServerArk to deal with the majority of them. If
anyone has any questions about the program, or any ideas on
what they would like to see in it in the future, by all means
let me know.<br>
<br>
Since I've been using it on our JA (Q3 protocol) servers (<a
moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://elitewarriors.net">http://elitewarriors.net</a>)
its blocked about 20 high volume attacks (one at 64Mbps)
successfully over the past few months. As long as the source
IP of the UDP flood is not random, it works really well.<br>
<br>
I have a few new ideas on flood detection on random IP attacks
I will ping off your guys over the next few days to see what
you think.<br>
<br>
Also kudos to whoever did the "I don't want to participate in
reflection attacks" iptables rule that matches off of the
'getstatus' UDP packet payload. If everyone who had a Q3
protocol server (COD, JA, etc) had that rule running
reflection attacks would be a LOT less potent.<br>
<br>
:)<br>
<br>
Thanks,<br>
<br>
<i>Boyd</i><br>
<br>
<div class="moz-signature"><i><font size="-1">__________________________________<br>
Boyd G. Gafford Ph.D.<br>
Manager of Software Development<br>
Westport Research Associates Inc.<br>
7001 Blue Ridge Blvd<br>
Raytown, MO 64133<br>
(816) 358-8990<br>
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