This section describes how to modify custom firewall rules.
To modify local firewall rules, edit the following file: /etc/iptables/rules.v4
Important: Add only targeted rules for addresses and ports. Do not add blanket drop or accept rules. SD-WAN Gateway will append its own rules to the table and, because the rules are evaluated in order, that may prevent Gateway software from functioning properly.
*filter :INPUT ACCEPT [0:0] -A INPUT -p udp -m udp --source 127.0.0.1 --dport 161 -m comment --comment "allow SNMP port" -j ACCEPT :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT
Restart netfilter service:
service netfilter-persistent restart service vc_process_monitor restart