To calculate bandwidth usage, PRTG inspects all network data packets either passing the PC's network card (shown on the left side in the schema above) or the data packages that a monitoring port of a switch (right side) sends with its built-in packet sniffer. PRTG can analyze the packets passing the network card of a PC or you can connected it to the monitoring port of a switch. sed -r -e 's,eth(0|1)(:)?: PACKET SNIFFER\((/sbin/dhclient3|/usr/sbin/dhcpd3)\+\]\),eth\: PACKET SNIFFER\(\),' \īe careful to leave the backslash at the end of the line.Monitoring with PRTG via Packet Sniffer Sensors To fix this issue, make a backup copy of /etc/cron.daily/chkrootkit then edit it and change. But the chkrootkit package maintainers never updated /etc/cron.daily/chkrootkit to work with version 4 series of the isc-dhcp-client and isc-dhcp-server packages, whose files don't have the version number. This is because on Debian, the binaries from these packages used to end with a version number, e.g. However, the workaround for the false positive doesn't work. The chkrootkit package's /etc/cron.daily/chkrootkit script has a workaround for this which tries to replaces the PID with a static string. The isc-dhcp-client and isc-dhcp-server packages (DHCP client and server) re-runs their daemons regularly and cause a "packet sniffer" false positive.
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