firmware/src/packages/fff/fff-firewall/files/usr/lib/firewall.d/20-filter-ssh

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# If an router has a direct internet connection simple attack act as DOS attack
iptables -A INPUT -i $IF_WAN -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -i $IF_WAN -j REJECT
# Limit ssh to 3 new connections per 60 seconds
/usr/sbin/ip6tables -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --set --name dropbear
/usr/sbin/ip6tables -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --update --seconds 60 --hitcount 3 --rttl --name dropbear -j DROP