[lvs-users] HOWTO Might Need Revision?

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: [lvs-users] HOWTO Might Need Revision?
From: "Robinson, Eric" <eric.robinson@xxxxxxxxx>
Date: Sat, 21 Mar 2009 07:56:36 -0700
The section on One Network LVS-NAT bothered me because disabling
redirects at the load balancer and removing the local LAN routes from
the RealServers would cause all network traffic between RealServers to
pass through the director. This is undesirable in environments where
inter-RS traffic is high, as with clustering and data replication.

I decided NOT to disable redirects OR remove the local LAN routes from
the RealServers. Instead, I just added explicit routes from each RS to
my client machine through the director and did the same on the client. I
figured I could live with some redirect traffic. It worked fine, and as
a side effect I noticed that no redirects were being sent by the
director machine anyway. Running sniffers simultaneously on the client,
the director, and the server, I observed no ICMP redirects being sent or
received. The traces also showed that requests and responses were in
fact passing through the director and being properly NATed.

You might want to consider adding a note to the One Network LVS-NAT
HOWTO indicating that if someone only has a few clients that need to
access RealServers on their own subnet through a director, using static
routes on each client and RS seems to be a better approach.

Eric Robinson

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