[Freeswitch-users] Security - IPtables, Fail2Ban, Rate Limit ..

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. https://freeswitch.org/confluence/display/FREESWITCH/Security # Trixter's SIP rate limiter (This helps protect you from DoS attacks) iptables -A INPUT -p udp --dport 5060 -m limit --limit 5/s --limit-burst 5 -i eth0 -j REJECT iptables -A INPUT -p udp --dport 5080 -m limit --limit 5/s --limit-burst 5 -i eth0 -j REJECT What is the best limit for 500 phones. Is there any other best practice to protect the system for Dos attacks. Thanks Lloyd