https://wassimaouadi.com/tags/firewall/ Recent content in Firewall on Hugo en Sun, 03 May 2026 21:31:13 +0200 https://wassimaouadi.com/technotes/junosfirewallfilters/ Sun, 03 May 2026 21:31:13 +0200 https://wassimaouadi.com/technotes/junosfirewallfilters/ <h1 id="definition">Definition</h1> <p>Firewall filters in Juniper Junos are stateless packet filters that act pretty much like the access lists in Cisco IOS, IOS XE and NX-OS. Once configured, they must be assigned in the input or output direction of one or more interfaces to become effective.</p> <h1 id="example-scenario-preventing-ping-packets-to-be-initiated-from-one-direction-while-allowing-the-other-direction">Example scenario: preventing ping packets to be initiated from one direction while allowing the other direction</h1> <h2 id="topology">Topology</h2> <p>R1:ge-0/0/5(.1) &lt;&mdash; 10.10.7.0/30 &mdash;&gt; (.2)ge-0.0.1:R5</p> <h2 id="configuration">Configuration</h2> <p>On R5:</p>