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Hi
Ive been looking into LVS to help balance load amongst some SMTP
servers.
I have set up a test LVS system in front of 3 real SMTP servers.
I'm using direct routing and have used the iptables method on all 3
real servers to overcome any arp issues
i.e. iptables -t nat -A PREROUTING -p tcp -d <vip> --dport 25 -j
REDIRECT
My testing seems to be going well and I can see traffic being balanced
between the 3 servers, however I ran tcpdump on the lvs server just to
look at the traffic and noticed im getting lots of TCP Retransmission
and some TCP Dup ACK's
I ran tcpdump on a normal SMTP server and don't see anywhere near as
many.
Can someone lend me their experience and advise if this something I
need to worry about and investigate further?
Thanks
Paul
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