Aug 17, 2017

IPTables . This is an example on how to configure a Linux IPTables firewall for Asterisk: # SIP on UDP port 5060. Other SIP servers may need TCP port 5060 as well iptables -A INPUT -p udp -m udp --dport 5004:5082 -j ACCEPT # IAX2- the IAX protocol iptables -A INPUT -p udp -m udp --dport 4569 -j ACCEPT # IAX - most have switched to IAX v2, or Fail2Ban - FreeSWITCH - Confluence May 24, 2018 RasPBX - Asterisk for Raspberry Pi / Discussion Apr 11, 2019 Fail2ban - Asterisk

The problem was the firewall rule was marking only incoming packets for conntrack sip helper. iptables -t raw -A PREROUTING -p udp -m udp --dport 5060 -j CT --helper sip When the PBX was the one to send the first packet toward the phone, it would establish a conntrack entry without sip helper. The entry continued to match the SIP conversation

Using iptables it is also easy to create such a rule (see Using iptables to rate-limit incoming connections). Firewall configuration. An example configuration for iptables can be found at Iptables on debian. Rate-Limit Examples. by Bret McDanel. It may be interesting to add rate-limiting of incoming SIP traffic. Below is an example of how this Sample Asterisk Firewall Rules - InPhonex Device # SIP on UDP port 5060. Other SIP servers may need TCP port 5060 as well iptables -A INPUT -p udp -m udp --dport 5004:5082 -j ACCEPT # IAX2- the IAX protocol iptables -A INPUT -p udp -m udp --dport 4569 -j ACCEPT # IAX - most have switched to IAX v2, or ought to iptables -A INPUT -p udp -m udp --dport 5036 -j ACCEPT # RTP - the media stream iptables - Wikipedia

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Dec 28, 2019 NAT with Linux and iptables - Tutorial (Introduction) iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT do not forget in addition to masquerading to authorize forwarding from your LAN. Say 192.168.0.0/24 is the LAN of your host and 192.168.1.0/24 the LAN you want to connect to the Web, then : iptables -I FORWARD 1 -s 192.168.1.0/24 ! -d 192.168.0.0/24 -j ACCEPT How-To: Redirecting network traffic to a new IP using IPtables Dec 05, 2008