I am wondering, which of those firewall rules are essential. After factory reset, there are several rules [talking about https://192.168.1.1/cgi-bin/luci/admin/network/firewall/rules ] such as Allow-DHCP-Renew , Allow-Ping , Allow-IGMP , two unnamed [Any esp From any host in wan To any host in lan] [Any udp From any host in wan To any host, port 500 in lan].
I’m curious, if I remove all the rules, will it impact functionality?
Btw. I couldn’t find any manual for Omnia Firewall settings :-/
I would understand, removing AllowingPing would make the router stop responding ping from WAN.
What about Allow-DHCP-Renew and Allow-IGMP?
When there is NAT in place, how can rule Any udp From any host in wan To any host, port 500 in lan make a host in WAN able to reach host in LAN when there is no port forwarding set?
What will be the most secure FW settings [considering NAT in place, no services running on Omnia, no port forwards, no special functions] ?