OCI Link-Local Addresses

Instances use link local addresses to access the instance metadata service (169.254.169.254:80), DNS (169.254.169.254:53), NTP (169.254.169.254:123), kernel updates (169.254.0.3), and iSCSI connections to boot volumes (169.254.0.2:3260, 169.254.2.0/24:3260). You can use host-based firewalls, such as iptables, to ensure that only the root user is authorized to access these IPs. Ensure that these operating system firewall rules are not altered.

iSCSI

Oracle Linux configures iscsi.service with /var/lib/iscsi/nodes/iqn.2015-02.oracle.boot:uefi/169.254.0.2,3260,1/default.

iscsi then triggers start of iscsid via iscsid.socket.

References

• https://docs.oracle.com/en-us/iaas/Content/Security/Reference/compute_security.htm