Reset your iptables

reset.sh

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
# https://serverfault.com/questions/200635/best-way-to-clear-all-iptables-rules
# To answer your question succinctly, no: there would not be any "leftover" rules after flushing every table. In the interest of being thorough however, you may want to set the policy for the built-in INPUT and FORWARD chains to ACCEPT, as well

iptables -P OUTPUT ACCEPT
iptables -t nat -F
iptables -t mangle -F
iptables -F
iptables -X


ip6tables -P INPUT ACCEPT
ip6tables -P FORWARD ACCEPT
ip6tables -P OUTPUT ACCEPT
ip6tables -t nat -F
ip6tables -t mangle -F
ip6tables -F
ip6tables -X