1. NLANR Web Caches & Squid Most Slides Provided by: Duane Wessels NLANR Caching Project

2. NLANR Caching Hierarchy

3. Caching Trade Offs Advantages –Reduces bandwidth –Reduces latency –Especially efficient on long/expensive pipes Disadvantages –Privacy issues –Administration, Support –Access controls, subscribed services

4. Proxy Cache Technologies Standard Proxy –Requires browser configuration Transparent Proxy –Packets are stolen from normal routing path –Workstations or custom hardware

5. NLANR - Squid Cache NLANR Cache Hierarchy –deployed world wide, there may already be NLANR connected Caches on STAR TAP Nets –a cache will be deployed at STAR TAP Squid Cache –Squid Software is free –Requires high-end PC < $5K –runs on Free BSD

6. Possible Configurations One or more parent caches at Gigapop, each institution with own cache. Multiple caches boxes at Gigapop, no institution caches No parent cache at Gigapop, institution caches peer with each other.

7. Caches at Gigapop and Institutions clients caches 30-50% 15-30%

8. Caches at Gigapop Only clients caches 40-55%

9. Caches at Institutions Only clients caches 30-50% hits misses 10%

10. More Information NLANR Cache Project http://ircache.nlanr.net/ Squid http://squid.nlanr.net/