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LVS Directory behind two firewalls

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: LVS Directory behind two firewalls
From: Jason Stubbs <jstubbs@xxxxxxxxxxxxx>
Date: Fri, 3 Sep 2004 14:13:29 +0900
Hi,

I've just started with LVS but everything is running smoothly so far. I have 9 
servers split between two firewalls. Each firewall is responsible for 5 
public IPs in two different subnets. There's a total of 6 different host 
names and, up until now, load balancing was done using DNS round robin for 
some of the hosts.

My goal is to have all services run on all servers and load balance across the 
lot. However, I realized that the two firewalls will cause me problems due to 
routing back. I've looked at the information in the HOWTO(1) and read the 
information I think it points to(2) but still don't understand how it works 
on the whole.

So, to state the question simply: How do I ensure that traffic takes the same 
outward path as its inward path?

Regards,
Jason Stubbs

1.http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.ipvsadm.html#Henrik
2.http://article.gmane.org/gmane.comp.security.firewalls.netfilter.devel/3708/
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