Health Checking Internet links behind proxy servers

Hi,

 

 

I have a requirement to load balance forward proxy servers with load balancing decisions based on the:

 

1. Availability of Proxy service itself (squid).

 

2. Availability of the Internet link that a proxy connects to.

 

3. Performance of the Internet link that a specific proxy connects to.

 

 

We have 3 forward proxy servers, each connected to a separate ISP link.

 

 

If an Internet is down the F5 box should be able to detect that and bypass the proxy server related to it.

 

 

If the Internet link performance is weak then the 5 box should respond to that by reducing the traffic on the related proxy accordingly (ratio will depend on the link condition).

 

 

The F5 salesman is saying that this possible using the F5 base code plus some scripting via iRules. Does anybody know if above is possible and guide me to a written script (if one already exists).

 

 

Thank you in advance

 

 

Rabih