Restrict FTP traffic on VIP to IP address or range

Hi Guys I have a couple of questions regarding this IRule, I hope someone can advise.

 

 

1. What effect would this IRule have on the 3600 LTM ? we would be looking to have 6 - 10 different IRules on 6-10 VIP Rules? Is there a maximum limit to how many IRules you can run on an F5 ? I'm worried about the processor. I've searched and have not been able to find a maximum recommended IRule amount

 

2. Would you recommend using this instead of a firewall ? or at least shift the work from the firewall to the LTM?

 

 

Any information would be gratefully received

 

 

Many thanks

 

Kav