CSS load balancing problem

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Dec 28th, 2007
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I have two CSS that I use to load balance RDP connections to two WTS servers. I dont have switch behind CSS so they are connected back-to-back via cable. All server facing ports (including back-to-back ports) are in the same VLAN.

CSS1 is primary for the VIP address and for redundant interface address, and CSS2 is standby.

So, when I connect WTS-1 to CSS-1 and WTS-2 to CSS-2, CSS1 sees both services as active and everything seems fine. If WTS-2 is disconnected, WTS2 service on CSS1 is down etc.

In sticky table, I can see that CSS1 is load balancing request to both servers, but the problem is that only RDP connections to WTS-1(server directly connected to CSS1) work fine , and connections that are load balanced to WTS-2 are dropped??? Direct RDP connection to WTS-2 IP works fine.

If I connect WTS-2 to CSS1, so both WTS servers are connected to CSS1 everything works fine.

Can anyone tell what can be wrong?

Configurations are in the attachment.

Thanks for help.



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Gilles Dufour Fri, 12/28/2007 - 07:18
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try the command 'ip uncond' on both CSS.

It will guarantees that the response from WTS-2 comes back to CSS1.



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