August 2018
Beginner
462 pages
12h 36m
English
Content preview from Learning OpenStack Networking - Third Edition
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Using DHCP to inject the route
When enable_isolated_metadata is set to True and the gateway for a subnet is not set or is not a Neutron router, the DHCP service is capable of injecting a route to the metadata service via the classless-static-route DHCP option, also known as option 121.
Possible DHCP options, including those leveraged by Neutron for various tasks, can be found on the IANA website at the following URL: https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml.
Once an instance connected to a subnet with the mentioned characteristics has been created, observe the following routes passed to the instance via DHCP:
The next hop address for the metadata route is the IP address of the DHCP server that responded ...
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