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Difference between revisions of "Firewalls"
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To view the current configuration you can use the command {{ic|ufw status}}. Here is what it looks like in a new install: | To view the current configuration you can use the command {{ic|ufw status}}. Here is what it looks like in a new install: | ||
sudo ufw status verbose | {{UserCmd|command=sudo ufw status verbose | ||
Status: active | <pre>Status: active | ||
Logging: on (low) | Logging: on (low) | ||
Default: deny (incoming), allow (outgoing), disabled (routed) | Default: deny (incoming), allow (outgoing), disabled (routed) | ||
New profiles: skip | New profiles: skip | ||
</pre> | </pre>}} | ||
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This indicates that it will block all incoming traffic and allow all outgoing traffic. This is a good starting point for most desktop systems. However, often we will want to allow some incoming traffic. This can be done with the command {{ic|ufw allow}}. For example, if we want to allow incoming ssh traffic so we can connect to the machine from other machines on the network we could use the command: | This indicates that it will block all incoming traffic and allow all outgoing traffic. This is a good starting point for most desktop systems. However, often we will want to allow some incoming traffic. This can be done with the command {{ic|ufw allow}}. For example, if we want to allow incoming ssh traffic so we can connect to the machine from other machines on the network we could use the command: | ||
sudo ufw allow ssh | {{UserCmd|command=sudo ufw allow ssh}} | ||
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If we wanted to also tcp connections to a local webserver on a non-standard https port, 8443. We could use the command: | If we wanted to also tcp connections to a local webserver on a non-standard https port, 8443. We could use the command: | ||
sudo ufw allow in 8443/tcp | {{UserCmd|command=sudo ufw allow in 8443/tcp}} | ||
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{{tip|When you don't specify "in" or "out", "in" is assumed}} | {{tip|When you don't specify "in" or "out", "in" is assumed}} | ||
==UFW and Applications== <!--T:14--> | ==UFW and Applications== <!--T:14--> | ||