Setup and Management

for theCacheRaQ

Confidential, Page 2

Cache Installation

• Outline

– Setup & Wizard

– Cache Configurations

– ICP

LCD Panel setup

• LCD panel configuration: – Enter the CacheRaQ's IP address, Netmask, and

Gateway address– For IP address and netmask:

• Use the Select button to select either "Setup Net1" or "Setup Net2", depending on which Ethernet interface you want to use.

– After configuring Net1 and/or Net2, choose "Setup Gateway" and enter Gateway IP address

– Choose Finished when done

• Proceed to web based setup

Setup Wizard - Step 1 of 4

• Connect to the CacheRaQ• Enter host, domain and DNS server

Setup Wizard - Step 2 of 4

• Cache Settings– Select Transparent or Traditional Proxy mode– Refresh frequency

Document refresh frequency : Enter 1-10, depending on how paranoid you are about getting fresh content (1 = very paranoid, 10 = not paranoid; 5 = default)

Setup Wizard - Step 3 of 4

• Enter Administrative settings

Setup Wizard - Step 4 of 4

• Enter Date, Time & Zone

Cache Administrative Site

Traditional Proxy Mode

• Essential feature – browsers are configured to make explicit

requests from the proxy server

• Implication– No changes are required to the existing

network structure. The CacheQube is simply put out on the network. It is just another host

Traditional Proxy CachingTraditional Proxy Caching

• Advantages– Familiar mode of operation– Non HTTP traffic does not go through

the web cache server– Router / Firewall address does not need

to be changed• Disadvantages

– Client browsers need to be reconfigured

ClientsClients

InternetInternet

100Mbps100Mbps

Content Content ServerServer

Proxy Web Proxy Web CacheCache

Transparent Mode

• Essential feature: No browser configuration required– Network is arranged so that all client traffic is

routed through the CacheRaQ, which then automatically caches HTTP traffic.

• Implication– Network must be arranged to route client traffic

through CacheRaQ. This requires knowledge of

TCP/IP networking.

Transparent ModeTransparent Mode

• Web caching server is installed ‘inline’

• Advantages– No client browser modifications– Usage monitoring can be

enforced• Disadvantages

– Router / firewall address may have to be changed

– All network traffic goes through web caching server

Content Content ServerServer

ClientsClients

InternetInternet

100Mbps100Mbps

Transparent Web Transparent Web CacheCache

Web Caching - Clustering

• You have some number of CacheRaQ– One will be the Cluster Master– The rest will be Cluster Slaves

• Configure the Cluster Master in the desired mode (traditional proxy mode or transparent mode).

• Configure the Cluster Slaves to be in traditional proxy mode.

• Note: For best performance, the cluster slaves should use the Network2 interface to communicate with the cluster master.

ClusteringClustering

• InstaCache Clustering allows scalable web caching performance

• Advantages– Very cost effective

technique for web server scaling

– Transparent operation - no client browser modifications

ClientsClients

InternetInternet

Cluster MasterCluster Master

Cluster SlavesCluster Slaves

Web Caching - Clustering

• Adding Clusters

High Speed ClusteringHigh Speed Clustering

• Advantages– Highly scalable– Non HTTP traffic does

not go through web cache

– Cache not a single point of failure

– Automatic failover

• Disadvantage– Additional cost of level-

4 switch (~$8,000)

In conjunction with Layer 4 SwitchingIn conjunction with Layer 4 Switching

ClientsClients

InternetInternet

Example using Alteon SwitchExample using Alteon Switch

Web Caching - ICPWeb Caching - ICP

• Internet Caching Protocol (ICP)– ICP is used to exchange hints about the

existence of URLs in neighbor caches.

– Caches exchange ICP queries and replies to gather information for use in selecting the most appropriate location from which to retrieve an object.

Web Caching - ICPWeb Caching - ICP

• Inter-Cache Protocol

• Advantages– Allows

hierarchical peering between cache servers

– Reduces latency– Saves bandwidth

for upstream peers

ICP ExampleICP Example

ClientsClients

InternetInternet

CustomerCustomerCacheRaQCacheRaQ

WANWAN

Web serverWeb server

ISP’s ISP’s CacheRaQCacheRaQ

(ICP Parent)(ICP Parent)WANWAN

LANLAN

InternetInternet

CacheRaQCacheRaQ

Sibling CacheRaQ

3. If sibling doesn’t have page, CacheRaQ will contact web site directly

1. Cache miss occurs. CacheRaQ then contacts sibling for web site and misses

2. CacheRaQ then contacts sibling

Note: sibling does not contact web site

Example Sibling OperationExample Sibling Operation

Example Parent OperationExample Parent Operation

InternetInternet

CacheRaQCacheRaQParent

CacheRaQ

2. Parent then contacts web site directly and caches page(s)

1. Cache miss occurs. CacheRaQ then contacts sibling for web site and misses

3. Parent then serves page(s) back to local CacheRaQ