Distributed Virtual Routing – Floating IPs

Assaf Muller

Where Am I?
Overview and East/West Traffic
SNAT
* Floating IPs

In The Good Old Days…

Legacy routers provide floating IPs connectivity by performing 1:1 NAT between the VM’s fixed IP and its floating IP inside the router namespace. Additionally, the L3 agent throws out a gratuitous ARP when it configures the floating IP on the router’s external device. This is done to advertise to the external network that the floating IP is reachable via the router’s external device’s MAC address. Floating IPs are configured as /32 prefixes on the router’s external device and so the router answers any ARP requests for these addresses. Legacy routers are of course scheduled only on a select subgroup of nodes known as network nodes.

Things Are About to Get Weird

In the DVR world, however, things are very different. This is going to get very complicated very fast so let’s understand how and…

View original post 1,341 more words

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