can you provide some more information, I'm not really looking for personal opinions, just what the limitations are, etc.. I'd like to implement a tranparent proxy just to Cache frequently visited web sites. As a good portion (30-60% on average) of our traffic is HTTP, I'd like to cut it down to make some room for other protocols. And make those frequently visited pages load faster.
http://www.msn.com is the default page for any IE browser and is like 200KB.. Caching commonly referenced pages can cut out a lot of that HTTP traffic going across our WAN link.
Just another way to increase our quality of service to the customer and to also help save us some bandwidth.
Also Reverse caching would be an added bonus to lighten the load on web servers, but that's not a huge concern as our webserver is a beast.