LVS/NAT - UM3 Issue

James Bowling james at alchemy.net
Wed May 9 18:56:12 BST 2007


Ok, I may just be overlooking something small but here is my setup:

               ----------------           ----------------
               :       ld1      :--HB--:       ld2      :      <----- 
directors and ld1 is a gateway
               ----------------           ----------------
                         |                             |            
<---- Virtual IP:  1.2.3.4 and ld1 GWip:  192.168.0.1
        -------------------------------------------------------
        |                |              |              |                |
       RS1         RS2        RS3         RS4         RS5...

Failover is working properly for the VIP and the GWip but here is the 
problem.  When I failover from ld1 to ld2 I can no longer get a response 
from the RSs.  I can login to each RS and get out just fine to anything 
so I know the GWip took fine and they can still route through it but for 
some reason the HTTP requests trying to come through once failed-over 
are not being sent to the RS.  I have verified this through doing 
"tcpdump -n -i eth0 port 80" on the RSs while trying to access the test 
page I have setup.  As soon as I fail back over to ld1 the connections 
continue.  I was thinking that it was some kind of ARP related issue but 
to test that theory I went to each server after failover to ld2 and 
cleared the ARP entry for the GWip.  Anybody have any ideas?  This is 
the only thing keeping me from having a working setup.  Thanks in advance!

-- 
Regards,
James Bowling <james at alchemy.net>
Director of Network Operations
Alchemy Communications, Inc.
818-206-9260 x4043


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