[lvs-users] MAC based forwarding ... backends calling each other ...

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: [lvs-users] MAC based forwarding ... backends calling each other ...
From: Lars Segerlund <lars.segerlund@xxxxxxxxx>
Date: Mon, 31 Oct 2011 16:03:17 +0100
 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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