I had not configured it and did not expect any rules to be configured, but iptables -L gives
Chain INPUT (policy DROP)
target prot opt source destination
DROP all — anywhere anywhere state INVALID
ACCEPT all — anywhere anywhere state RELATED,ESTABLISHED
DROP tcp — anywhere anywhere tcp option=!2 flags:SYN/SYN
input_rule all — anywhere anywhere
LAN_ACCEPT all — anywhere anywhere
ACCEPT icmp — anywhere anywhere
ACCEPT gre — anywhere anywhere
REJECT tcp — anywhere anywhere reject-with tcp-reset
REJECT all — anywhere anywhere reject-with icmp-port-unreachable
Chain FORWARD (policy DROP)
target prot opt source destination
DROP all — anywhere anywhere state INVALID
TCPMSS tcp — anywhere anywhere tcp flags:SYN,RST/SYN TCPMSS clamp to PMTU
ACCEPT all — anywhere anywhere state RELATED,ESTABLISHED
forwarding_rule all — anywhere anywhere
ACCEPT all — anywhere anywhere
Chain OUTPUT (policy DROP)
target prot opt source destination
DROP all — anywhere anywhere state INVALID
ACCEPT all — anywhere anywhere state RELATED,ESTABLISHED
output_rule all — anywhere anywhere
ACCEPT all — anywhere anywhere
REJECT tcp — anywhere anywhere reject-with tcp-reset
REJECT all — anywhere anywhere reject-with icmp-port-unreachable
Chain LAN_ACCEPT (1 references)
target prot opt source destination
ACCEPT all — anywhere anywhere
Chain forwarding_rule (1 references)
target prot opt source destination
Chain forwarding_wan (0 references)
target prot opt source destination
Chain input_rule (1 references)
target prot opt source destination
Chain input_wan (0 references)
target prot opt source destination
Chain output_rule (1 references)
target prot opt source destination