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<p class="MsoNormal">This likely does not apply to most VSPs, but our clients are confined to about 10 IPs and our upstream provider has about 6. The only solution I found is to block everything but these.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However, before that fix, I found that EVERY attempt to hack in was via IP Address. We use the multidomain setup, so no number@ipaddresss will ever work, they must be @<fqdn>.<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> FreeSWITCH-users <freeswitch-users-bounces@lists.freeswitch.org>
<b>On Behalf Of </b>Lloyd Aloysius<br>
<b>Sent:</b> Tuesday, September 24, 2019 8:27 AM<br>
<b>To:</b> FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org><br>
<b>Subject:</b> [Freeswitch-users] Security - IPtables, Fail2Ban, Rate Limit ..<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Recently see lots of attacks. Try to protect the system. Currently using iptables and fail2ban. It is not enough. I see the following page explain rate limit.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><a href="https://freeswitch.org/confluence/display/FREESWITCH/Security">https://freeswitch.org/confluence/display/FREESWITCH/Security</a> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"># Trixter's SIP rate limiter (This helps protect you from DoS attacks)<br>
iptables -A INPUT -p udp --dport 5060 -m limit --limit 5/s --limit-burst 5 -i eth0 -j REJECT<br>
iptables -A INPUT -p udp --dport 5080 -m limit --limit 5/s --limit-burst 5 -i eth0 -j REJECT<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">What is the best limit for 500 phones. Is there any other best practice to protect the system for Dos attacks.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Thanks<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Lloyd<o:p></o:p></span></p>
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