http headers

ok. I have one virtual server .77. I am currently running one pool sps_pool with nodes .78/.79 in this pool. On .78/.79 there is only one web service running. .78 is the main server and .79 is an exact image of .78.

 

 

Now the same customer wants to throw 2 more servers .80/.81 into the mix. On these servers they will run a minimum of 7 websites. They will be using the same virtual server .77 for these sites. In their iis config they are only using the URL name to address these different websites. One, do I need an Irule to point all of these different websites coming in from .77 to differentiate between the first pool that is working correctly sps_pool and the new pool for .80/.81. Or do I need to just create a new pool and throw the two new nodes into this pool. Will the big-ip beable to direct these URL's to the correct server? I am getting more lost. I have talked with F5 and gone out and read the documentation on irules and everything that has to do with sharepoint and setting it up. I don't understand irules and I do not uderstand where I would need to place my host header information in an irule. I am completely retarded when it comes to this. If anyone wants you can call me directly at 229-291-7622