August 2018
Beginner
462 pages
12h 36m
English
Content preview from Learning OpenStack Networking - Third Edition
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Tracing a packet through the SNAT namespace
In the following example, the green VM sends traffic to 8.8.8.8, a Google DNS server:
|
Source MAC |
Destination MAC |
Source IP |
Destination IP |
|
Green VM |
Green Router Interface (qr1) |
Green VM |
8.8.8.8 (Google DNS) |
When traffic arrives at the local qrouter namespace, the main routing table is consulted. The destination IP, 8.8.8.8, does not match any directly connected subnet, and a default route does not exist. Secondary routing tables are then consulted, and a match is found based on the source interface. The router then routes the traffic from the green VM to the green interface ...
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