<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">Ok. Thanks. :)</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jun 27, 2014 at 11:05 PM, Mitul Limbani <span dir="ltr"><<a href="mailto:mitul@enterux.in" target="_blank">mitul@enterux.in</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">No way out. Fix ur gateway which is masquerading out to in traffic.</p>
<p dir="ltr">And do some research as others mentioned instead of expecting quick fix.</p>
<p dir="ltr">Mitul </p>
<div class="gmail_quote"><div><div class="h5">On 27-Jun-2014 10:45 PM, "Anurag Rana" <<a href="mailto:anuragrana31189@gmail.com" target="_blank">anuragrana31189@gmail.com</a>> wrote:<br type="attribution">
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">Can't use anything which block IP addresses because my system is behind a gateway and attacker gets the address of that gateway. In this way I will end up blocking myself. </div>
<div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">Please suggest something else.</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Fri, Jun 27, 2014 at 10:24 PM, Anurag Rana <span dir="ltr"><<a href="mailto:anuragrana31189@gmail.com" target="_blank">anuragrana31189@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">Right Mitul. System is behind some gateway.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>
On Fri, Jun 27, 2014 at 10:06 PM, Mitul Limbani <span dir="ltr"><<a href="mailto:mitul@enterux.in" target="_blank">mitul@enterux.in</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><p dir="ltr">I think your asterisk server is behind firewall or some sort of NAT where the out to in packets are getting masqueraded with local or DMZ IP of your firewall / gateway box.</p>
<p dir="ltr">Fix this first to get fail2ban detect the correct public IP. </p>
<p dir="ltr">Otherwise fail2ban will ban your local GW IP due to which you won't be able to access the box even from your local network for ssh.</p>
<p dir="ltr">Hope u know how to fix the firewall snat. </p>
<p dir="ltr">Mitul </p>
<div class="gmail_quote"><div><div>On 27-Jun-2014 9:51 PM, "Jai Rangi" <<a href="mailto:jprangi@didforsale.com" target="_blank">jprangi@didforsale.com</a>> wrote:<br type="attribution"></div></div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>
<div dir="ltr"><div><div>Anurag,<br><br></div><div>Here is small script, that will check your logs and will block the IPs. <br></div><a href="http://www.didforsale.com/blog/is-your-asterisk-system-under-heavy-attack" target="_blank">http://www.didforsale.com/blog/is-your-asterisk-system-under-heavy-attack</a><br>
<br></div>This is good if you dont expect any registration. If you do have some valid registration, you might want to add some counter to see how time IP need to fail or how many different users IP is trying to register on before blocking the IP. <br>
<div><br></div><div>Jai Rangi<br></div><div><a href="http://www.didforslae.com" target="_blank">www.didforslae.com</a> <br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jun 27, 2014 at 7:37 AM, Anurag Rana <span dir="ltr"><<a href="mailto:anuragrana31189@gmail.com" target="_blank">anuragrana31189@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)"><br clear="all"></div>
<div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">Hi All.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">
<br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">Someone is attacking on my SIP server.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">
There are lot of requests coming in and I am not able to stop it because I am unable to detect the IP address. </div>
<div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">I used wireshark to capture the packets.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)"><br></div>
<div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">Although I am using very strong password for my SIP users but still is there any way to drop these packets and stop this attack.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">
<br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">I tried dropping packet after matching some string (most of the packets from attacker contains string 'VaxSIPUserAgent/3.1' ) but it failed. Packets are still flowing in. </div>
<div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><pre style="font-size:medium"><font color="#0000ff">iptables -I INPUT 1 -p tcp --dport 5060 -m string --string "VaxSIPUserAgent" --algo bm -j DROP</font></pre>
</div><div><br></div><div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">Its something like this</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">
<br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><font color="#0000ff">Registration from '"30" <sp:30@my_public_ip:5060> failed for '192.168.xxx.xxx:6373' - Wrong Password</font></div>
<br></div><div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">and there are approx 10 request per minute of this type.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">
<br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">Please suggest some way to stop this.</div><span><font color="#888888"><br></font></span></div><span><font color="#888888"><div>
<br></div>-- <br><div dir="ltr"><span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><font size="4"><font size="4"><font face="verdana,sans-serif"><font>Anurag Rana <br>
<font size="1"><span style="color:rgb(56,118,29)"><a href="http://newbie42.blogspot.in/" target="_blank">http://newbie42.blogspot.in/</a></span><br><span style="color:rgb(106,168,79)">On the trampoline of life's experiences, Striving towards a saintly life in the midst of these materialistic turbulences.</span></font><br>
</font><br></font></font></font></font></span><div><span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><br></font></span></div></div>
</font></span></div>
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<br clear="all"><div><br></div>-- <br><div dir="ltr">
<span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><font size="4"><font size="4"><font face="verdana,sans-serif"><font>Anurag Rana <br><font size="1"><span style="color:rgb(56,118,29)"><a href="http://newbie42.blogspot.in/" target="_blank">http://newbie42.blogspot.in/</a></span><br>
<span style="color:rgb(106,168,79)">On the trampoline of life's experiences, Striving towards a saintly life in the midst of these materialistic turbulences.</span></font><br></font><br></font></font></font></font></span><div>
<span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><br></font></span></div></div>
</font></span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><font size="4"><font size="4"><font face="verdana,sans-serif"><font>Anurag Rana <br>
<font size="1"><span style="color:rgb(56,118,29)"><a href="http://newbie42.blogspot.in/" target="_blank">http://newbie42.blogspot.in/</a></span><br><span style="color:rgb(106,168,79)">On the trampoline of life's experiences, Striving towards a saintly life in the midst of these materialistic turbulences.</span></font><br>
</font><br></font></font></font></font></span><div><span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><br></font></span></div></div>
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<span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><font size="4"><font size="4"><font face="verdana,sans-serif"><font>Anurag Rana <br><font size="1"><span style="color:rgb(56,118,29)"><a href="http://newbie42.blogspot.in/" target="_blank">http://newbie42.blogspot.in/</a></span><br>
<span style="color:rgb(106,168,79)">On the trampoline of life's experiences, Striving towards a saintly life in the midst of these materialistic turbulences.</span></font><br></font><br></font></font></font></font></span><div>
<span style="background-color:rgb(255,255,255)"><font style="font-family:georgia,serif" face="garamond,serif"><br></font></span></div></div>
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