Hi, we try to implement an Apache Linux server as a reverse proxy for different kinds of backend web servers to achieve a homogeneous web space. One of the backend servers is an Microsoft IIS server with an NLB (Network Load Balancing) Cluster of two systems. On that IIS server runs a CMS system that requires Load Balancing Affinity. That all works well but the problem is that the NLB service sees always the same IP address (that of the Apache reverse proxy) so only one of the two real servers got the load. So I tried to assign the hostname of the reverse proxy two IP-addresses and assign to the only single physical network-interface that two IP-adresses. In a first test I set up two IP-based virtual servers hoping that round robin DNS resolution would lead to a nearly equally workload of the so realized two reverse proxy servers. That seems to work well in the first simple tests but unfortunately the outgoing requests to the backend servers (via a "RewriteRule" using the "P" flag) always contain the IP-address of the "main" (the first assigned) IP-adress and not the two required IP-adresses to make the NLB probably "happier". So another very raw idea of using (instead of the non-perfect DNS round robin approach) two further internal reverse proxy servers with different IP addresses and splitting the traffic conditionally via a "SetEnvIf Remote_Addr ..." directive seems superfluous. Any ideas to handle this situation (second network-interface, iptables, additional server hardware or ...) ? I hope my question isn't too off-topic. Greetings Jens -- Dr. Jens Schleusener T-Systems Solutions for Research GmbH Tel: +49 551 709-2493 Bunsenstr.10 Fax: +49 551 709-2169 D-37073 Goettingen Jens.Schleusener@xxxxxxxxxxxxx http://www.t-systems.com/ --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
|