Source for ifOperStatus information?

  We build net-snmp 5.4.1 from scratch, and run it on an embedded Linux
with  kernel 2.6.16.

  How does the snmpd agent keep ifOperStatus up to date?

  net-snmp appears to offer multiple methods for a Linux system:

- agent/mibgroup/if-mib/data_access/interface_sysctl.c
netsnmp_arch_interface_container_load()

- agent/mibgroup/if-mib/data_access/interface_ioctl.c
netsnmp_access_interface_ioctl_flags_get()

  From context, I guess that the sysctl method is used when the agent
first sets up ifTable, while the ioctl method is used afterwards.

  Does snmpd have an option to use ethtool if that method is available?

  Thanks for any guidance,

  Ron



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