Direct Routing - Red Hat LINUX VIRTUAL SERVER 5.1 - ADMINISTRATION Manual

Linux virtual server (lvs) for red hat enterprise linux 5.1

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Direct Routing

which uses network address translation to replace the address of the real server in the packets

with the LVS routers public VIP address. This process is called IP masquerading because the

actual IP addresses of the real servers is hidden from the requesting clients.

Using this NAT routing, the real servers may be any kind of machine running various operating

systems. The main disadvantage is that the LVS router may become a bottleneck in large

cluster deployments because it must process outgoing as well as incoming requests.

4.2. Direct Routing

Building an LVS setup that uses direct routing provides increased performance benefits

compared to other LVS networking topologies. Direct routing allows the real servers to process

and route packets directly to a requesting user rather than passing all outgoing packets through

the LVS router. Direct routing reduces the possibility of network performance issues by

relegating the job of the LVS router to processing incoming packets only.

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