Cisco WAE-7326-K9 Spécifications télécharger pdf (Page 474)

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Cisco Wide Area Application Services Command Reference

OL-21611-01

Chapter 3 CLI Commands

tethereal

To analyze network traffic from the command line, use the tethereal EXEC command.

tethereal [LINE]

Syntax Description

Defaults No default behavior values.

Command Modes EXEC

Device Modes application-accelerator

central-manager

Usage Guidelines Tethereal is the command-line version of the network traffic analyzer tool Ethereal. Like TCPdump, it

also uses the packet capture library (libpcap). Aside from network traffic analysis, Tethereal also

provides facilities for decoding packets.

When using the -a option to print heavy traffic to the screen, it can take significantly longer than the

autostop duration to display the information on the screen. Wait for the command to finish. Displaying

output to the console can take significantly longer than through telnet or SSH, therefore console display

is not recommended.

When using the -f option with the host or not host filter expression, the wrong traffic may be captured

with WCCP GRE encapsulated or VLAN traffic. With WCCP GRE traffic, tethereal sees only the

outermost IP address, not the original IP address inside the encapsulated packets. Add the proto 47

keyword into the -f filter expression to capture the correct traffic (protocol 47 is GRE traffic).

Additionally, for VLAN traffic, add the vlan keyword into the -f filter expression so that VLAN traffic

is parsed correctly.

When using the -a filesize option together with the -R option, tethereal may stop unexpectedly and print

the message "Memory limit is reached" before reaching the specified autostop file size. In this case, the

maximum memory limit for the command was reached before the autostop file size limit.

Examples The following example shows how to display the options available with the WAAS tethereal command:

WAE# tethereal -h

tethereal: Setting virtual memory limit to 209715200

TShark 1.0.0

Dump and analyze network traffic.

See http://www.wireshark.org for more information.

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

LINE (Optional) Options. For more information see the “Usage Guidelines” and

“Examples” sections.

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