Linux computer system sensor

The Linux® computer system sensor discovers computer systems running the Linux operating system.

Sensor name that is used in the GUI and logs

LinuxComputerSystemSensor

Prerequisites

If you discover Red Hat Enterprise Linux 7, or CentOS Linux 7 with the Linux computer system sensor, you must install the ifconfig command on the targets. This command is included in the net-tools package.

Limitations

All computer system sensors and the SNMP MIB2 sensor ignore network interfaces that are configured to be down. TADDM does not populate the net.IpNetwork attribute on the following types of IP interfaces:
  • loopback, for example, 127.0.0.1, 0:0:0:0:0:0:0:1
  • link-local, for example, 169.254.1.1, FE80:0:0:0:0:0:0:1
  • multicast, for example, 224.0.0.1, FF00:0:0:0:0:0:0:1
  • unspecified, for example, 0.0.0.0, 0:0:0:0:0:0:0:0
Therefore, IP networks are not populated in the TADDM user interface.

Discovery of IPv6 interfaces and IPv6 routing and forwarding information

The sensor discovers IPv6 interfaces and IPv6 routing and forwarding information about target systems that are configured to support IPv6. TADDM runs discoveries against only IPv4 addresses. TADDM does not start a sensor against IPv6 addresses. For DNS lookups, TADDM uses either the IPv4 or the IPv6 addresses. TADDM does not populate the net.IpNetwork attribute on an IPv6 interface if the prefix length value is unspecified or equals zero.

The discovered IPv6 addresses are displayed in the TADDM user interface similarly to IPv4 addresses and are accessible using the TADDM API. Because IPv6 addresses use a prefix length value instead of an IPv4 netmask, only one of these values is populated for an IP address. The value depends on the address type.