[Seaside] Get rid of unwanted traffic

[Sebastian Sastre]

Hi guys,
I'm seeing some requests from ad servers hitting the cluster. 
Has anyone blogged about best practices to get rid of unwanted traffic for
seaside applications?
I'm thinking about making a rewrite rule that only sends traffic to the balancer
when it at least has the _s and _k parameters. What do you think? How you deal
with this?
Thanks,
Sebastian