<html><head></head><body bgcolor="#FFFFFF"><div>Yep. I have nowhere near that many per machine. I did the 100 as an extreme test. Perhaps another setting is freaking out? :)<br><br><div>EscapedTurkey Billing and Support</div>
<a href="https://escapedturkey.com/helpdesk">https://escapedturkey.com/helpdesk</a></div><div><br>On Mar 9, 2012, at 2:38 PM, "Boyd G. Gafford Ph.D." <<a href="mailto:drboyd@westportresearch.com">drboyd@westportresearch.com</a>> wrote:<br>
<br></div><div></div><blockquote type="cite"><div>
<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type">
Yeah, 1000 a second is way too high, that would support like 500
games servers on the same hardware lol.<br>
<br>
We'll take this to a private Email...<br>
<br>
:)<br>
<br>
Boyd<br>
<div class="moz-signature"><br>
</div>
<br>
On 03/09/2012 01:00 PM, escapedturkey wrote:
<blockquote cite="mid:CALCvV0z0nj615C7Uk5hk=ev_VeSR0MZCKSRyxNdt0ctRJoJSWQ@mail.gmail.com" type="cite">
<div>It's quite a powerful machine, more than 5. =)<br>
</div>
<div><br>
</div>
<div>Still doesn't work .. </div>
<div><br>
</div>
<div> /sbin/iptables -N LIMITSTAT<br>
/sbin/iptables -A LIMITSTAT -p udp -m limit --limit 1000/sec
--limit-burst 1000 -j ACCEPT<br>
/sbin/iptables -A LIMITSTAT -p udp -j DROP<br>
<br>
# Add a limit/drop chain for "getinfo" packets that limits it to
10 a second for all servers.<br>
# If you are only protecting one server, you can set the number
from 10 down to 4 (or 2 even).<br>
<br>
/sbin/iptables -N LIMITINFO<br>
/sbin/iptables -A LIMITINFO -p udp -m limit --limit 1000/sec
--limit-burst 1000 -j ACCEPT<br>
/sbin/iptables -A LIMITINFO -p udp -j DROP</div>
<div><br>
</div>
<div>Can you e-mail me so we can experiment?</div>
<div><br>
</div>
<div>Thank you. :)</div>
<div><br>
</div>
<br>
<div class="gmail_quote">On Fri, Mar 9, 2012 at 1:40 PM, Boyd G.
Gafford Ph.D. <span dir="ltr"><<a href="mailto:drboyd@westportresearch.com" target="_blank">drboyd@westportresearch.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> How many servers are
running on the one machine?<br>
<br>
You might need to up the LIMITSTAT and LIMITINFO chains to
more than 10/sec if you have a bunch of servers being
handled by that rule.<br>
<br>
10/sec is good for about 4 or 5 game servers.<br>
<br>
You can see if your limits make sense by looking at "sudo
iptables -L -v -n" and looking at dropped packets in the
LIMITSTAT and LIMITINFO chains. If you see some of dropped
packets (but are not under a 'getstatus' or 'getinfo'
attack) then up it from 10 to maybe 20 or so.
<div><br>
<br>
Thanks,<br>
<br>
<i>Boyd</i><br>
<div><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>
<a href="tel:%28816%29%20358-8990" value="+18163588990" target="_blank">(816)
358-8990</a><br>
<a href="mailto:drboyd@westportresearch.com" target="_blank">drboyd@westportresearch.com</a><br>
</font></i><br>
</div>
<br>
</div>
<div>
<div> On 03/09/2012 12:09 PM, escapedturkey wrote:
<blockquote type="cite">Seems to have killed qstat
status check. <br>
<br>
Without ServerArk:<br>
<br>
qstat -old -R -P -a2s <a href="http://208.43.15.2:27015" target="_blank">208.43.15.2:27015</a><br>
<a href="http://208.43.15.2:27015" target="_blank">208.43.15.2:27015</a>
"<a href="http://EscapedTurkey.com">EscapedTurkey.com</a> Dallas, TX" map de_dust at (null)
0/32 players 1 ms<br>
<br>
ServerArk running:<br>
<br>
qstat -old -R -P -a2s <a href="http://208.43.15.2:27015" target="_blank">208.43.15.2:27015</a><br>
<a href="http://208.43.15.2:27015" target="_blank">208.43.15.2:27015</a>
no response<br>
<br>
This is what I am using:<br>
<br>
# The main logic of ServerArk, all done with
/sbin/iptables!<br>
<br>
# Version 1.01<br>
# (C) 2012 Boyd G. Gafford Ph.D. (Usage is under the
LGPL)<br>
# To contact me, simply post on the forum at <a href="http://elitewarriors.net" target="_blank">elitewarriors.net</a>.<br>
#<br>
# Please note these rules ONLY affect UDP packets to
the game servers, nothing else!<br>
# This script will protect all Q3-protocol servers on
the port 28960. It protects<br>
<br>
# against both 'getstatus' and 'getinfo' attacks, as
well as 'getchallenge' atttacks,<br>
# even from a UDP flood with random source IPs.<br>
<br>
# Add a limit/drop chain for "getstatus" packets that
limits it to 10 a second for all servers.<br>
# If you are only protecting one server, you can set
the number from 10 down to 4 (or 2 even).<br>
<br>
/sbin/iptables -N LIMITSTAT<br>
/sbin/iptables -A LIMITSTAT -p udp -m limit --limit
10/sec --limit-burst 10 -j ACCEPT<br>
/sbin/iptables -A LIMITSTAT -p udp -j DROP<br>
<br>
<br>
# Add a limit/drop chain for "getinfo" packets that
limits it to 10 a second for all servers.<br>
# If you are only protecting one server, you can set
the number from 10 down to 4 (or 2 even).<br>
<br>
/sbin/iptables -N LIMITINFO<br>
/sbin/iptables -A LIMITINFO -p udp -m limit --limit
10/sec --limit-burst 10 -j ACCEPT<br>
/sbin/iptables -A LIMITINFO -p udp -j DROP<br>
<br>
<br>
# Add a limit/drop chain for "getchallenge" packets
that limits it to 5 a second for all servers.<br>
# If you are only protecting one server, you can set
the number from 5 down to 2. Setting it<br>
# at 2 means only 2 players could connect to the
server per second. Set LIMITCONN to the<br>
# same, as there is one getchallenge/connect packet
sequence per valid player connection.<br>
<br>
/sbin/iptables -N LIMITCHLG<br>
/sbin/iptables -A LIMITCHLG -p udp -m limit --limit
5/sec --limit-burst 5 -j ACCEPT<br>
/sbin/iptables -A LIMITCHLG -p udp -j DROP<br>
<br>
<br>
# Add a limit/drop chain for "connect" packets that
limits it to 5 a second for all servers.<br>
# If you are only protecting one server, you can set
the number from 5 down to 2. Setting it<br>
# at 2 means only 2 players could connect to the
server per second. Set LIMITCHLG to the<br>
# same, as there is one getchallenge/connect packet
sequence per valid player connection.<br>
<br>
/sbin/iptables -N LIMITCONN<br>
/sbin/iptables -A LIMITCONN -p udp -m limit --limit
5/sec --limit-burst 5 -j ACCEPT<br>
/sbin/iptables -A LIMITCONN -p udp -j DROP<br>
<br>
<br>
# Add a limit chain that prevents more than 70 packets
a second per player.<br>
# This is the main logic of ServerArk, but just
performed by an iptable rule.<br>
# We allow up to 128 players which is enough for 4
servers full (at 32 players each).<br>
# If you only have one server, you could the size and
max to 32.<br>
# If you have players who have manually set their
packet rate up to 100, just change the 70 to 100.<br>
<br>
/sbin/iptables -N LIMITPLRS<br>
/sbin/iptables -A LIMITPLRS -p udp -m hashlimit
--hashlimit-name PLAYERS --hashlimit-above 100/sec
--hashlimit-burst 100 --hashlimit-mode srcip,srcport
--hashlimit-htable-size 128 --hashlimit-htable-max 128
--hashlimit-htable-gcinterval 1000
--hashlimit-htable-expire 10000 -j DROP<br>
/sbin/iptables -A LIMITPLRS -p udp -j ACCEPT<br>
<br>
<br>
# Add the rules to pick out the various special
packets and send them to appropriate limit chains.<br>
# To protect 5 ports, just specify a range like
"--dport 28960:28964" below.<br>
<br>
/sbin/iptables -A INPUT -p udp --dport 27000:30000 -m
string --string "getstatus" --algo bm --from 32 --to
33 -j LIMITSTAT<br>
/sbin/iptables -A INPUT -p udp --dport 27000:30000 -m
string --string "getinfo" --algo bm --from 32 --to 33
-j LIMITINFO<br>
/sbin/iptables -A INPUT -p udp --dport 27000:30000 -m
string --string "getchallenge" --algo bm --from 32
--to 33 -j LIMITCHLG<br>
/sbin/iptables -A INPUT -p udp --dport 27000:30000 -m
string --string "connect" --algo bm --from 32 --to 33
-j LIMITCONN<br>
<br>
<br>
# Send all other packets (normal player packets) to
the limit players chain.<br>
# A port range like "--dport 28960:28964" could also
be used here as well.<br>
# /sbin/iptables -A INPUT -p udp --dport 28960 -j
LIMITPLRS<br>
<br>
<div> /sbin/iptables -A INPUT -p udp --dport
27000:30000 -j LIMITPLRS<br>
</div>
<div><br>
</div>
<div class="gmail_quote">On Fri, Mar 9, 2012 at 11:41
AM, Boyd G. Gafford Ph.D. <span dir="ltr"><<a href="mailto:drboyd@westportresearch.com" target="_blank">drboyd@westportresearch.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Yeah, if
they flood "getstatus" and "getinfo", during the
attack your server will not be visible from the
master list.<br>
<br>
If they flood "getchallenge", during the attack
nobody will be able to join your server.<br>
<br>
Once the attack ends, then you'll be visible
again and people can join normally.<br>
<br>
Since most of these attacks are from spoofed
random IP addresses (millions of them), you
can't limit per IP, as no IP repeats.<br>
<br>
This set of rules is about the best I've found
short of doing a whitelisted server, where you
only allow IP's of known good players, and block
everything else, and then people have to join
the server with "connect IP:PORT". That's
fairly inconvenient for most players, so these
rules are about as good as you can get and still
allow usage from the master list.<br>
<br>
Thanks,<br>
<font color="#888888"> <br>
<i> Boyd</i></font>
<div><br>
<div><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>
<a href="tel:%28816%29%20358-8990" value="+18163588990" target="_blank">(816)
358-8990</a><br>
<a href="mailto:drboyd@westportresearch.com" target="_blank">drboyd@westportresearch.com</a><br>
</font></i><br>
</div>
<br>
</div>
<div>
<div> On 03/09/2012 10:00 AM, Ruediger Meier
wrote:
<blockquote type="cite">
<pre>On Friday 09 March 2012, Boyd G. Gafford Ph.D. wrote:
</pre>
<blockquote type="cite">
<pre>Just wanted to share these with the COD group here. I've been
running these rules for about a week now, and they have been working
wonderfully. Let me know if you end up using them and how they work
for you.
</pre>
</blockquote>
<pre>Be aware that now it's easy for a attacker to make your servers
invisible for others by flooding your limit rules.
Maybe you should rather limit per ip.
cu,
Rudi
</pre>
<blockquote type="cite">
<pre>#!/bin/bash
# The main logic of ServerArk, all done with iptables!
# Version 1.01
# (C) 2012 Boyd G. Gafford Ph.D. (Usage is under the LGPL)
# To contact me, simply post on the forum at <a href="http://elitewarriors.net" target="_blank">elitewarriors.net</a>.
#
# Please note these rules ONLY affect UDP packets to the game
servers, nothing else!
# This script will protect all Q3-protocol servers on the port 28960.
It protects
# against both 'getstatus' and 'getinfo' attacks, as well as
'getchallenge' atttacks,
# even from a UDP flood with random source IPs.
# Add a limit/drop chain for "getstatus" packets that limits it to 10
a second for all servers.
# If you are only protecting one server, you can set the number from
10 down to 4 (or 2 even).
iptables -N LIMITSTAT
iptables -A LIMITSTAT -p udp -m limit --limit 10/sec --limit-burst 10
-j ACCEPT
iptables -A LIMITSTAT -p udp -j DROP
# Add a limit/drop chain for "getinfo" packets that limits it to 10 a
second for all servers.
# If you are only protecting one server, you can set the number from
10 down to 4 (or 2 even).
iptables -N LIMITINFO
iptables -A LIMITINFO -p udp -m limit --limit 10/sec --limit-burst 10
-j ACCEPT
iptables -A LIMITINFO -p udp -j DROP
# Add a limit/drop chain for "getchallenge" packets that limits it to
5 a second for all servers.
# If you are only protecting one server, you can set the number from
5 down to 2. Setting it
# at 2 means only 2 players could connect to the server per second.
Set LIMITCONN to the
# same, as there is one getchallenge/connect packet sequence per
valid player connection.
iptables -N LIMITCHLG
iptables -A LIMITCHLG -p udp -m limit --limit 5/sec --limit-burst 5
-j ACCEPT
iptables -A LIMITCHLG -p udp -j DROP
# Add a limit/drop chain for "connect" packets that limits it to 5 a
second for all servers.
# If you are only protecting one server, you can set the number from
5 down to 2. Setting it
# at 2 means only 2 players could connect to the server per second.
Set LIMITCHLG to the
# same, as there is one getchallenge/connect packet sequence per
valid player connection.
iptables -N LIMITCONN
iptables -A LIMITCONN -p udp -m limit --limit 5/sec --limit-burst 5
-j ACCEPT
iptables -A LIMITCONN -p udp -j DROP
# Add a limit chain that prevents more than 70 packets a second per
player. # This is the main logic of ServerArk, but just performed by
an iptable rule.
# We allow up to 128 players which is enough for 4 servers full (at
32 players each).
# If you only have one server, you could the size and max to 32.
# If you have players who have manually set their packet rate up to
100, just change the 70 to 100.
iptables -N LIMITPLRS
iptables -A LIMITPLRS -p udp -m hashlimit --hashlimit-name PLAYERS
--hashlimit-above 70/sec --hashlimit-burst 70 --hashlimit-mode
srcip,srcport --hashlimit-htable-size 128 --hashlimit-htable-max 128
--hashlimit-htable-gcinterval 1000 --hashlimit-htable-expire 10000 -j
DROP iptables -A LIMITPLRS -p udp -j ACCEPT
# Add the rules to pick out the various special packets and send them
to appropriate limit chains.
# To protect 5 ports, just specify a range like "--dport 28960:28964"
below. iptables -A INPUT -p udp --dport 28960-m string --string
"getstatus" --algo bm --from 32 --to 33 -j LIMITSTAT
iptables -A INPUT -p udp --dport 28960-m string --string "getinfo"
--algo bm --from 32 --to 33 -j LIMITINFO
iptables -A INPUT -p udp --dport 28960-m string --string
"getchallenge" --algo bm --from 32 --to 33 -j LIMITCHLG
iptables -A INPUT -p udp --dport 28960-m string --string "connect"
--algo bm --from 32 --to 33 -j LIMITCONN
# Send all other packets (normal player packets) to the limit players
chain. # A port range like "--dport 28960:28964" could also be used
here as well. iptables -A INPUT -p udp --dport 28960-j LIMITPLRS
/
/Also, you can do an "iptables -L -v -n" to see what kind of attacks
these rules have blocked. Here's an example of this command after a
"getchallenge" flood attack from random IPs, on our Dallas server
running on port 29070.
ew@server1:~$ sudo iptables -L -v -n
Chain INPUT (policy ACCEPT 11368 packets, 1538K bytes)
pkts bytes target prot opt in out source
destination
3880 177K LIMITSTAT udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> udp dpt:29070 STRING match "getstatus" ALGO name
bm FROM 32 TO 33
14036 617K LIMITINFO udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> udp dpt:29070 STRING match "getinfo" ALGO name bm
FROM 32 TO 33
37M 1620M LIMITCHLG udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> udp dpt:29070 STRING match "getchallenge" ALGO
name bm FROM 32 TO 33
17 4989 LIMITCONN udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> udp dpt:29070 STRING match "connect" ALGO name bm
FROM 32 TO 33
237K 17M LIMITPLRS udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> udp dpt:29070
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source
destination
Chain OUTPUT (policy ACCEPT 343K packets, 54M bytes)
pkts bytes target prot opt in out source
destination
Chain LIMITCHLG (1 references)
pkts bytes target prot opt in out source
destination
40025 1761K ACCEPT udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> limit: avg 5/sec burst 5
*37M 1618M DROP* udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
Chain LIMITCONN (1 references)
pkts bytes target prot opt in out source
destination
17 4989 ACCEPT udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> limit: avg 5/sec burst 5
0 0 DROP udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
Chain LIMITINFO (1 references)
pkts bytes target prot opt in out source
destination
14036 617K ACCEPT udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> limit: avg 10/sec burst 10
0 0 DROP udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
Chain LIMITPLRS (1 references)
pkts bytes target prot opt in out source
destination
1642 104K DROP udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> limit: above 70/sec burst 70 mode srcip-srcport
htable-size 128 htable-max 128
236K 17M ACCEPT udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
Chain LIMITSTAT (1 references)
pkts bytes target prot opt in out source
destination
3868 177K ACCEPT udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a> limit: avg 10/sec burst 10
12 516 DROP udp -- * * <a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
<a href="http://0.0.0.0/0" target="_blank">0.0.0.0/0</a>
Notice the bolded packet/byte statistics for the "getchallenge" drop
chain named LIMITCHLG. A total of 37 million packets dropped. I was
on the game during this attack, and although the server did lag a bit
from the sheer size of the flood (almost saturating the bandwidth),
nobody lagged out. Without this rule, the game server deadlocked.
Also notice you can tell how many players have connected to the
server, as the LIMITCONN status shows 17 packets accepted. So during
this time we had 17 players join the game.
You can also see how many people requested the servers in game (as
well as other services like GameTracker getting info on you), as that
corresponds to the LIMITSTAT and LIMITINFO chains.
Another cool thing you can do is "cat /proc/srv/ipt_hashlimit/PLAYERS
to see the IP addresses of all the players currently connected to the
server(s). Once a player quits playing, he goes out of this file
automatically after 10 seconds.
I may refine these a bit further, but for now, these seem to be
working well on our VPS.
Thanks,
/Boyd/
</pre>
</blockquote>
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</pre>
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