October 2014
Intermediate to advanced
300 pages
6h 24m
English
Content preview from LEARNING OPENSTACK NETWORKING (NEUTRON)Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Exploring how instances get their addresses
When DHCP is enabled on a subnet, a dnsmasq process is spawned in a network namespace whose name corresponds to the network UUID. In the event that a process already exists, the dnsmasq process is updated to support the additional subnet in the network.
Most instances rely on DHCP to obtain their associated IP address. DHCP goes through the following stages:
- A DHCP client sends a
DHCPDISCOVERYpacket using a broadcast address. This is usually 255.255.255.255. - A DHCP server responds to the request with a
DHCPOFFERpacket. The packet contains the MAC address of the instance that makes the request, the IP address, the subnet mask, lease duration, and the IP address of the DHCP server. - In response to the offer, ...
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