![]() It's a network software emulator that lets you see everything that's happening on a network as it happens. What Tools Should You Use to Visualize Network Traffic?Īny time you're experimenting with new technologies or skills on a network, we recommend using GNS3 (Graphical Network Simulator-3). ![]() Inside (target) network's host IP is 10.10.10.1 and that we're trying to gain access on Port 23 (telnet). In this case, because we want to set up traffic filtering through ACLs on the ASA, you'll want to imagine placing an Adaptive Security Appliance in between a device on an outside network and a device on an "Inside" network.įor the explanation that follows, assume that the Outside (originator) network's host IP is 192.168.1.1. ![]() If no match is found, then the packet is denied. If a matching rule is found, the packet is allowed to proceed. When a packet tries to enter an Adaptive Security Device, it gets tested against every rule in the ACL. What is an Access Control List?Īn Access Control List, often referred to as an ACL, is a list of rules that explain what can or cannot enter or leave a router's interface. Traffic filtering allows for it and a powerful and customizable way to do that is with Access Control Lists.īut what about when you need someone on the outside to be able to come in and do things on the inside? Or what if you want to stop someone on the inside from accessing specific outside resources? Fortunately, it's possible to instruct your ASA about which traffic is permissible. With a Cisco Adaptive Security Appliance set up on your network, by default, a low-security interface - like a so-called "outside" interface at Level 0 - can't go in and access resources on a high-security interface - like an "inside" interface at level 100. Watch now When Would You Need Traffic Filtering?Īnytime you want to permit someone on the outside of your protected network access something on the inside, or prevent someone on the inside from accessing specific resources on the outside, you need traffic filtering.
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