What is the default action for firewall filters?
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In Junos OS, firewall filters are used to control and manage network traffic by applying policies to specific interfaces, protocols, or traffic types. Firewall filters determine whether to allow or deny traffic based on defined rules, actions, and conditions.
The default action for firewall filters is to "discard" traffic that does not match any of the defined filter rules. This means that traffic is dropped and not forwarded to the next hop, which effectively blocks traffic that is not explicitly allowed by the firewall rules.
It is important to note that the default action can be changed to a different action, such as "accept" or "reject", depending on the security requirements of the network.
"Accept" action: If the default action is set to "accept", any traffic that does not match the defined filter rules will be allowed and forwarded to the next hop.
"Reject" action: If the default action is set to "reject", traffic that does not match the filter rules will be dropped and the sender will receive an ICMP message indicating that the traffic has been rejected.
"Log" action: If the default action is set to "log", traffic that does not match the filter rules will be logged and then discarded.
In summary, the default action for firewall filters in Junos OS is "discard", which drops traffic that does not match the defined filter rules. However, the default action can be changed to "accept", "reject", or "log" based on the security requirements of the network.