Destination based redirect irule, a'la cache.pac implementing?

If you add a RULE_INIT event with a log statement, do you see the log statement written to /var/log/ltm? If so, then I'd guess the traffic is matching a more specific VIP or not hitting LTM at all. If you don't see the log statement, it's probably because syslog-ng is configured for external logging or customized to not log to the default destination /var/log/ltm.

 
 when RULE_INIT { 
    log local0. "Test" 
 } 
 

Aaron