v16 Linux Firewall best practice

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B.Fluehmann

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We have switched our 3cx pbx from Windows to the official 3cx Debian iso.
After the setup I checket iptables configuration and saw that it contains some
preset rules. Unfortunately many of the rules make no sense to me.
Examples:
  • Duplicate entries
  • Destination sip.mcast.net in INCOMMING chain
  • Accept any any rule in the middle of the rules

Now I wonder if this is something specific to our installation or if this is a general issue of the iso.

What is the best practice of 3cx iptables configurations? Stick to the preconfigured rules, adjust/enhance them
or rip the whole config and build it from scratch?

Regards
Bernhard
 
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