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List:       linux-virtual-server
Subject:    [lvs-users] MAC based forwarding ... backends calling each other ...
From:       Lars Segerlund <lars.segerlund () gmail ! com>
Date:       2011-10-31 15:03:17
Message-ID: CAF-VNapeCe1BJam31XMK3f5pUSYn-eW189ee8CwwWkHAU811zw () mail ! gmail ! com
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 Hi ,

 I got direct routing setup , and I use iptables with the cluster
adress to make the machine accept incoming trafic.

 iptables -t nat -A PREROUTING -d <cluster adress>  -j REDIRECT

 If I put the adress on the loopback , the server can't call the load
balancer/ cluster address ... since all traffic goes to loopback .

 It works like a charm, however in my app, the backend servers can
call each other , ( via cluster adress ), this also works like a
charm, except for the case where a server is calling a service on
itself via the cluster adress.

 It seems the return trafic gets lost, and I have been hard at it
trying to find a solution ....

 I guess I have something similar as DNAT on the same network ....

 Does anybody have any ideas ?

 The only thing I have thought of is changing the ip of a packet
incoming to the machine ... based on mac ... to the IP of the machine,
this in not however easily done .

 I'm going off to try to log dropped packets since tcpdump & wireshark
doesn't give me anything funky.

 Best regards, Lars Segerlund.

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