The first thing we have to do is tell the router what packets we are interested in capturing. This guide will explain how to capture packets on a Cisco IOS based router and then export the captures to a TFTP for examination in Wireshark.Īll of the commands associated with configuring, running, monitoring and exporting the capture, with the exception of defining the filter access list, are entered in global exec mode. When it comes to troubleshooting a suspected network problem, taking a filtered look at packets flowing through a router can give a network engineer insight in to how that traffic is being handled and potentially pinpoint the source of the issue.
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February 2023
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