NAT FTP Clients and Linux-2.6 on Load-Balancer

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: NAT FTP Clients and Linux-2.6 on Load-Balancer
From: Donald J Giuliano <guido@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 30 Aug 2005 17:30:41 +0000

I'm currently working to migrate two linux-2.4/keepalived IPVS 
load-balancers to new machine running linux-2.6/keepalived.  
Everything works perfectly on the old setup, but on the new machines 
the load-balanced FTP fails when the client is behind a NAT 
firewall.  I'm running the Antefacto ipvs-nfct patch on both the 2.4.26 
and 2.6.12 configuration so that the LBs can also function as 
firewalls.  I have made no changes to the iptables configuration, 
other than removing some superfluous rules filtering "unclean" packets, 
which aren't supported in 2.6 anyway.  All the same IPVS kernel modules 
are loaded on both machines.  The keepalived configurations are 
identical.  Any idea what would cause this problem?  

Donald Giuliano
Oklahoma Climatological Survey
100 East Boyd St. Room 1210
Norman, OK, 73019

Phone: 405-325-0399
Email: guido@xxxxxxxxxxxxxxxxxxxxx

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