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The packet capture feature was added in version 62 and allows you to capture real packets on interfaces Packet capture supports multiple, simultaneous capture processes; however, packet capture can affect the performance of the appliance, so disable it when you are finished troubleshooting your problem When capturing packets, you can control what is captured by using various filters, like an ACL Once packets are captured, you can view them from the CLI or save them to a file in a libpcap format file, which can then be viewed by a protocol analyzer like WireShark (which is a free protocol analyzer)
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To configure a packet capture process, use the following syntax, where Table 6-3 covers the parameters in the capture command:
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ciscoasa# capture capture_name [type {asp-drop [drop_code] | raw-data | isakmp | webvpn user webvpn_user [url url]}] [access-list ACL_ID] [buffer buffer_size] [ethernet-type type] [interface logical_if_name] [packet-length bytes] [circular-buffer] [trace trace_count]
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Explanation Specifies the name of the packet capture You can use the same name on multiple capture commands to capture multiple types of traffic in one captured process Optionally lets you specify the type of data captured Optionally captures packets dropped by the accelerated security path The drop_code specifies the type of traffic that is dropped by the accelerated security path Use the show asp drop frame command for a list of drop codes Note that if you do not enter a drop code, then all dropped packets are captured Optionally captures inbound and outbound packets on one or more interfaces this is the default setting Optionally captures IPSec ISAKMP traffic Optionally captures WebVPN data for a specific WebVPN connection
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Table 6-3 Packet Capture Parameters
6:
Access Control
Parameter
Explanation
Optionally specifies a URL prefix to match for data capture typically this is done for WebVPN users Use this kind of syntax for the URL: http://server/path or https:// server/path to capture traffic to a web server
access-list buffer
Optionally captures traffic that matches only on permit statements in the ACL Optionally defines the buffer size used to store the packet in bytes; once the byte buffer is full, the packet capture process stops Optionally selects an Ethernet type to capture, where the default is IP packets An exception occurs, however, with the 8021Q or VLAN type The 8021Q tag is automatically skipped, and the inner Ethernet type is used for matching Optionally defines the logical name of the interface on which to enable packet capture Note that you must configure an interface for any packets to be captured; however, you can configure multiple interfaces using multiple capture commands with the same capture_name If you want to capture packets on the data plane of an ASA, use the interface keyword with asa_dataplane as the name of the interface (This is used to capture packets from the optional IPS and CSC cards in the ASA) Optionally sets the maximum number of bytes of each packet to store in the capture buffer Optionally overwrites the buffer, starting from the beginning, when the packet capture buffer is full Optionally captures packet trace information and the number of packets to capture This is used with an ACL to insert trace packets into the data path when troubleshooting connection problems with the packet-tracer command
ethernet-type
interface
packet-length circularbuffer trace
Table 6-3 Packet Capture Parameters (Continued)
Here s an example that illustrates the use of packet capturing:
ciscoasa# access-list httpACL permit tcp any host 192168110 eq 80 ciscoasa# capture httpcap access-list httpACL packet-length 250 interface outside
Cisco ASA Configuration
In the preceding example, the first 250 bytes of packets sent to 192168110, on TCP port 80, are captured as they enter the outside interface TIP To make it easier to troubleshoot connections, associate an ACL to the packet capture process to limit the information you re capturing to the specific problem a connection is having
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