Proxied IIS site delay issues

@webber wrote:

I have set up a single haproxy server to load balance hundreds of sites running on two IIS servers. It works but after a while some client ip's have long delays connecting to sites. If I clear arp on both of the IIS servers with "arp -d *" the issue goes away for a while.

I have set the ArpCacheSize to 8000 (hex) in the registry on both servers and that has helped but there is still an issue. Is there a garbage collecting timeout that also needs to be reduced in the registry? I have also tuned the linux kernel on the haproxy server for raising the arp-related settings:

net.ipv4.route.gc_thresh = 524288
net.ipv4.neigh.default.gc_thresh1 = 8192
net.ipv4.neigh.default.gc_thresh2 = 16384
net.ipv4.neigh.default.gc_thresh3 = 32768

Any ideas on a permanent fix besides flushing arp on the WIndows 2012 backend servers?

Thanks.

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