11/12/2022 0 Comments Cisco packet capture tool![]() Stop the capture and view the buffer switch-1#monitor capture PACKET stopĬapture statistics collected at software:Ĭapture buffer will exists till exported or cleared Configure and start a packet capture switch-1#monitor capture PACKET interface Gi1/0/10 both access-list PACKET-ACLģ. Switch-1(config-ext-nacl)#permit ip host 172.16.10.10 host 10.10.10.10 Please note that having deny ip any any at the end has resulted in packets not being captured, so please don't add deny statement at the end.Ģ. Configure the ACL (optional) switch-1(config)#ip access-list extended PACKET-ACL ![]() Packet capture is configured in exec mode so, the configuration is not stored within the running-configuration and will not remain in place after a system reload.ġ. ![]() CISCO PACKET CAPTURE TOOL HOW TOThe following example shows, how to capture all the traffic between the laptop and both servers. The capture can be performed on physical interfaces, sub-interfaces, and tunnel interfaces. The captures can also be exported as a pcap file to allow for further analysis. Once the packets are captured and saved, they can be viewed in a summary or detailed view on the CLI. The packets are then stored in a buffer temporarily or you can optionally save them to the local flash. Once you configured the capture, the switch/router captures the packets sent and received. The process is very straightforward and only takes a couple of minutes to set it up. This enables us to easily take captures directly from the switch and export them for analysis. Monitor capture command in privileged EXEC mode.The Embedded Packet Capture feature was introduced in IOS-XE 15.2(4)S. To configure monitor capture specifying an attachment point and the packet flow direction, use the Sets conditions in a named IP access list. Specifies attachment points with direction. Monitor capture (interface/control plane) The following example shows how to define a core system filter using an existing class map:ĭevice(config-cmap)# match access-group name aclĭevice# monitor capture mycap class-map classmap1Ĭonfigures the match criteria for a class map on the basis of the specified ACL. The following example shows how to define a core system filter using an existing access control list:ĭevice(config)# ip access-list standard acl1ĭevice# monitor capture mycap access-list acl1 Monitor capture match command, the command replaces the existing filter. If you have already specified the filter when you entered the You can specify a class map, or an access list, or an explicit inline filter as the core filter. Ip access-list command or the class map using theĬommand. Syntax DescriptionĬonfigures an access list with the specified name.Ĭonfigures a class map with the specified name.Ī monitor capture with the specified access list or a class map as the core filter for the packet capture is not configured. To disable monitor packet capturing, use the no form of this command. To enable and configure monitor packet capturing, use the the monitor capture privileged EXEC mode command.
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