Transparent proxy caching
Browser sends requests for web pages to origin server
Impact on non-web traffic: Cache sits in data path, examines all out-bound packets, intercepts and processes web traffic
No browser reconfiguration required
Caches must be configured to do network address translation
Each client hits only one cache
- Difficult to take advantage of data stored in other local caches, lowering hit rate
If cache is down, user loses all Internet access until alternate path operational