With a Reveal(x) system or an ExtraHop Trace appliance connected to a Discover appliance, you can search for and download packets for selected transactions through the Packets feature in the ExtraHop Web UI and the Packet Search resource in the ExtraHop REST API. The downloaded packets can then be analyzed through a third-party tool, such as Wireshark.
- For ExtraHop Reveal(x) systems that do not include continuous packet capture, you can configure precision packet capture by writing a trigger.
- For Discover appliances, you must deploy a Trace appliance. See the deployment guides for the ExtraHop Trace appliance.
You can launch a quick packet query for the current time interval by clicking Packets from the top menu. The ExtraHop system queries packets for the selected time interval, such as the last 30 minutes, and displays the Packet Query page. If you change the time interval, the query starts again. Either end of the gray bar displays a timestamp, which is determined by the current time interval. The time on the right displays the starting point of the query and the time on the left displays the endpoint of the query. The blue bar indicates the time range during which the system found packets. You can drag to zoom on a period of time in the blue bar to run a query again for that selected time interval.
The following figure provides an overview of the Packet Query page and features:
|Tip:||Filter packets with Berkeley Packet Filter syntax.|
There are multiple locations in the ExtraHop Web UI from which you can initiate a packet query:
- Type an IP address in the global search field and then select the Search Packets icon
- Click Packets from the upper right corner of a device page.
- Click the Packets icon next to any record on a record query results page.
- Click on an IP address or hostname in any chart with metrics for network bytes or
packets by IP address to see a context menu. Then, select the Packets icon to query for the
device and time interval.