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Packet Capture on Router Interfaces

Packet capture is supported on the T1, T3, E1, E3, serial, Fast Ethernet, ADSL, G.SHDSL, PPPoE, and ISDN interfaces.

To capture packets on an ISDN interface, configure packet capture on the dialer interface. To capture packets on a PPPoE interface, configure packet capture on the PPPoE logical interface.

Packet capture is not supported on tunnel interfaces.

Packet capture supports PPP, Cisco HDLC, Frame Relay, and other ATM encapsulations. Packet capture does not support multilink encapsulations such as multilink PPP (MLPPP).

You can capture all IPv4 packets flowing on an interface in the inbound (ingress) or outbound (egress) direction or in both directions. Use the J-Web configuration editor or CLI configuration editor to specify maximum packet size, the filename to be used for storing the captured packets, maximum file size, maximum number of packet capture files, and the file permissions. See Configuring Packet Capture on an Interface (Required).

For packets captured on T1, T3, E1, E3, serial, and ISDN interfaces in the outbound (egress) direction, the size of the packet captured might be 1 byte less than the maximum packet size configured because of the packet loss priority (PLP) bit.

To modify encapsulation on an interface that has packet capture configured, you must first disable packet capture. For more information, see Changing Encapsulation on Interfaces with Packet Capture Configured.


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