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TIBCO Rendezvous® 8.7.0

# The pcap Facility

`rvtrace` uses the `pcap` facility to capture network packets.

## Obtaining pcap

Before using `rvtrace`, you must first ensure that the `pcap` facility is properly installed.

On most UNIX platforms, `pcap` is ready to use.

For Windows, you can download the `WinPcap` NDIS packet capture driver from this URL:

| • | http://www.winpcap.org/install/default.htm

For Windows platforms with multiple network interfaces, see also Selecting the Network Interface.

## Packet Filtering

`pcap` has a flexible filtering language for selecting the set of packets to capture. `rvtrace` inherits this language through its `-filter` parameter.

You can select packets based on source, destination, host, network interface, port, packet length, and protocol. Packets that match the filter appear in `rvtrace` output; packets that do not match are ignored.

## See Also

-filter expr

Filtering

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