Login on the console with a sudo user (root)
Approach 1: Simple
To List UFW (default firewall on Ubuntu) run the following command
$ sudo ufw status verbose
Sample output
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), deny (routed)
New profiles: skip
To Action From
— —— —-
66.61.246.79 80/tcp ALLOW IN Anywhere
66.61.246.78 80/tcp ALLOW IN Anywhere
To disable UFW firewall run the following command
$ sudo ufw disable
——————————————————————————————————
Old school Approach
Alternatively, run the following command to list any existing firewall rules
$ sudo iptables -L –n
Sample output
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT udp — 0.0.0.0/0 0.0.0.0/0 udp dpt:53
ACCEPT tcp — 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
ACCEPT udp — 0.0.0.0/0 0.0.0.0/0 udp dpt:67
ACCEPT tcp — 0.0.0.0/0 0.0.0.0/0 tcp dpt:67
Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all — 0.0.0.0/0 172.148.102.0/24 state RELATED,ESTABLISHED
ACCEPT all — 172.148.102.0/24 0.0.0.0/0
ACCEPT all — 0.0.0.0/0 0.0.0.0/0
REJECT all — 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
REJECT all — 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
To stop and Flush all the rules run the following commands
$ sudo iptables -X
$ sudo iptables -t nat -F
$ sudo iptables -t nat -X
$ sudo iptables -t mangle -F
$ sudo iptables -t mangle -X
$ sudo iptables -P INPUT ACCEPT
$ sudo iptables -P FORWARD ACCEPT
$ sudo iptables -P OUTPUT ACCEPT
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